GW Instek GPM8310  Digital Power Meter with RS232C / USB device & host / LAN / GPIB
GW Instek GPM8310 is a digital power meter for singlephase (1P/2W) AC power measurement. Features include DC, 0.1Hz~100kHz test bandwidth, 16bits A/D, and 300 kHz sampling rate. It adopts a 5” TFT LCD screen with a fivedigit measurement display and provides 25 power measurement related parameters, and has a highprecision measurement capability. It also features the ability to display waveform (voltage/current/power), the integration measurement function, harmonic measurement and analysis of each order (meeting the IEC 6100047 harmonics measurement requirements at 50/60Hz), external sensor input terminals, and various communication interfaces, etc., to help users achieve clear, convenient and accurate power measurements. This power meter is the most costeffective power meter with the most complete functionalities among the products of the same category.
The rated direct input voltage of GPM8310 is 600V and the input current is 20A. The minimum current level is 5mA (resolution up to 0.1uA) and the power measurement resolution is 0.1uW. The crest factor can reach 3 (half measurement range can reach 6 or 6A), and the voltage/current/power measurement capability can reach (±0.05% reading ±0.1% level). Different measurement modes can be selected according to ( AC+DC/ AC/ DC/ VMEAN), providing up to 25 relevant parameters for power measurement, including voltage (Vrms/ Vac/ Vdc/ Vmn/ V+pk / Vpk), current (Irms/ Iac/ Idc/ I+pk/ Ipk), frequency (VHz/ IHz), power (P/ P+pk/ Ppk), crest factor (CFV/ CFI), apparent power (VA), reactive power (VAR), power factor (PF), phase angle (DEG), total harmonic distortion rate (THDV/THDI), maximum current ratio (MCR), and the MATH calculation function. Hence, for the measurement of low current/low power such as standby power consumption, or the measurement of power consumption of general products, this power meter provides the best range and accuracy support.
GPM8310 also makes good use of the advantages of the TFT LCD to display the results of parameter measurement by using numerical and graphical methods. In terms of numerical values, the general mode and the simple mode are provided. The general mode can display 10 measurement parameters (2 main measurements + 8 monitoring measurements), and the simple mode can display four measurement parameters. These displayed parameters can be arbitrarily selected from 25 power parameters according to the needs of users. In terms of graphic display, a simple oscilloscope mode is provided to display waveforms for three parameters including voltage, current, and power. In addition, the measurement and analysis of each harmonic order of the measurement signal can be completely displayed by numerical values or bar graphs. This power meter not only meets the needs of accuracy and legibility inprocess testing but also meets the needs of diverse measurement applications in R&D design and quality verification.
In addition, the performance of GPM8310 in auxiliary measurement mechanism/function is also comprehensive. For the application of measuring large voltage, the VT rate setting can be used with an external voltage Potential Transformer. For the measurement of large current, the type of current transformer ~ voltage output type or current output type will determine the applied method. If it is a current output type, it can be directly locked to the rear panel of the instrument and collocated with the CT rate setting to conduct measurement. If it is a voltage output type, the measurement can be conducted through the external current sensor input terminals (EXT1/EXT2) provided by GPM8310. Automatic levelchanging can selfdefine the required level to save a levelchanging time. 10,000 lots of internal memories can be used to store measurement data according to the update rate set by GPM8310 or a userdefined time interval for subsequent analysis.
In terms of data retrieval and storage, GPM8310 provides a variety of communication interfaces including RS232C/ USB device (virtual COM)/ LAN/ GPIB. Users can write programs to read the measurement results according to their habits or with existing system interfaces and there is no need to procure interfaces. USB host supports GPM8310 screen capture, internal record data access, and firmware update. For the needs of external signal control or the use of data recorder to record data, GPM8310 also provides an optional Digital I/O (DA4) interface (must be installed before leaving the factory), which can be connected to an external controller such as PLC or a data recorder to meet the application of automatic measurement or long recording.
Various Display Modes
Numerical (General) Mode
Numerical (Simple) Mode
Waveform Mode
Harmonic (Bar Graph) Measurement
Harmonic (Table Column) Measurement
GPM8310 provides the numerical value display mode and the waveform display mode, which help users to maximize the benefit of their measurement. Under the numerical mode, there are the general mode and the simple mode. The general mode has related measurement settings and can simultaneously display 10 measurement parameters (2 main measurements and 8 secondary measurements). The simple mode displays only 4 measurement parameter results. The parameters in each mode can be arranged and combined as required. Under the graphic mode, a simple oscilloscope function is provided to display the waveforms of three parameters including voltage, current, and power. The horizontal scale can be adjusted (from 25us/div ~ 1s/div according to the set data update rate), and 3 magnification rates for waveform observation are also provided for users to select. In the harmonic measurement, the measurement results of each order of harmonics can be displayed by bar graphs, and a specific observation order can be specified. The relevant values of each order of harmonics (voltage/current/power/voltage distortion ratio/current distortion ratio/power distortion ratio/voltage phase angle/current phase angle) can be completely recorded and displayed.
Rich Measurement Parameters
Measurement Items  Symbols 

Voltage  Vrms, V+pk, Vpk, Vac*, Vdc*, Vmn 
Current  Irms, I+pk, Ipk, Iac*, Idc* 
Power  P, P+pk, Ppk, VA, VAR 
Power Factor  PF 
Crest Factor  CFV, CFI 
Phase Angle  DEG 
Frequency  VHz, IHz 
Total Harmonic Distortion  THDV, THDI 
Maximum Current Ratio  MCR 
Integration  WP, WP+, WP, q, q+, q, Vac, Iac 
Note : “*” Only applicable to specific measurement modes for selection
GPM8310 provides a variety of measurement items and functions, including voltage, current, frequency, effective power, apparent power, reactive power, power factor, crest factor, total harmonic distortion, and can also measure the maximum current ratio. GPM8310 is also equipped with the measurement function of power or current time integration for the DUT. Users set a period of time to perform instantaneous power With respect to the support of measurement assistance, the performance of GPM8310 is outstanding. First of all, for the measurement of high voltage/high power, the setting of voltage ratio/power ratio is provided to restore the attenuated ratio to a true value. For the measurement of large current, other than the setting of current ratio, external current sensor terminals (EXT1/EXT2) can be utilized to connect with a voltage output type current transformer, making large current measurement more GPM8310 provides the measurement of the integration function under the automatic levelchanging mode to allow users to fully calculate the total value of the power consumption of the DUT from the beginning to the end of the integration function. In addition, GPM8310 also supports integration at the set time period, and then divide by the time to obtain the average power of the DUT. In addition, when performing integration measurement, GPM8310 supports an automatic levelchanging function for the power change of the DUT at different times in order to obtain the most complete integration result within the set time.
Superb Measurement Assistance
Ratio Configuration
External Current Sensor Input
With respect to the support of measurement assistance, the performance of GPM8310 is outstanding. First of all, for the measurement of high voltage/high power, the setting of voltage ratio/power ratio is provided to restore the attenuated ratio to a true value. For the measurement of large current, other than the setting of current ratio, external current sensor terminals (EXT1/EXT2) can be utilized to connect with a voltage output type current transformer, making large current measurement more convenient. In addition, GPM8310 provides 4 sets of panel settings for storage/recall and memory for storing 10,000 lots of measurement values. The measurement storage can log the measurement results based upon the update rate or a selfdefined time interval to facilitate the subsequent analysis. The USB host on the front panel supports screen capture, measurement value storage, and GPM8310 firmware update.
Flexible LevelChanging Mechanism
Automatic levelchanging under the integration function
Selfdefined automatic levelchanging mechanism
GPM8310 provides the measurement of the integration function under the automatic levelchanging mode to allow users to fully calculate the total value of the power consumption of the DUT from the beginning to the end of the integration function. In addition, GPM8310 also supports a selfdefined setting mechanism for levelchanging. Users can select the required level to be changed to save time on levelchanging and expedite the test.
Convenient and Practical Interface
Practical Interface
DA4 Interface Mechanism
GPM8310 provides comprehensive and diverse communications interfaces including RS232 / USB / LAN / GPIB, which are suitable for customers to write computer software for remote control and the collection of measurement results through commands. The optional Digital I/O (DA4) interface provides 3 different modes: the external control mode, the DA4 output mode, and the selfdefined output mode based on user settings. When the setting is in the external control mode, it allows users to activate, stop, trigger or reset the integration measurement function through external signals. When the setting is in the DA4 output mode, users can define 4 measurement parameter values from the 25 measurement parameters provided (even with the result of integration measurement) to produce outputs by a fixed level (full scale +5V) or a manual level (full scale ±5V) and receive results by collocating with a data recorder. When the setting is in the selfdefined output mode, a communications interface is required to control the action of each defined pin through commands.
Pannel Introduction
 5” TFT LCD
 DC, 0.1Hz ~ 100kHz voltage/current test bandwidth
 Two numerical display modes: General mode: displays 2 main test items + 8 secondary test items; Simple mode: displays the test values of 4 main test items
 Waveform display: V (voltage), I (current), P (power)
 The current/voltage can be measured to a deformed wave with CF of 3, and the halfrange CF can reach 6 or 6A
 50th order of harmonic measurement and analysis (value and bar graph)
 The integration function supports automatic levelchanging
 External current sensor input terminals (EXT1/EXT2)
 Standard interfaces: RS232C, USB device/ host, LAN, GPIB
 Optional interface: Digital I/O (DA4) (must be installed before leaving the factory)
 Optional accessory: GPM001
Input
Input Type 
 
Measure range 
 
Input Impedance 
 
Continuous maximum allowable input 
 
Input bandwidth  DC, 0.1 Hz ~ 100kHz  
Continuous maximum Commonmode voltage  600 Vrms, CAT Ⅱ  
Line filter  select OFF or ON (cut off frequency of 500 Hz)  
Frequency filter  select OFF or ON (cut off frequency of 500 Hz)  
A/D converter  Simultaneous conversion voltage and current inputs Resolution 16bits Maximum conversion rate Approx. 300kHz 
Voltage and Current Accuracy
Requirements 
After 30 minutes after warmup time has passed  
Accuracy 
 
Temperature coefficient 
 
When the line filter is turned ON 
 
Accuracy when the crest factor is set to 6 or 6A  accuracy obtained by doubling the measurement range error for the accuracy when the crest factor is set to 3  
Accuracy changes caused by data update interval  When the data update interval is 100 ms, and Auto, add 0.05% of reading to the 0.1 Hz to 1 kHz accuracy.  
Influence of Temperature Changes After ZeroLevel Compensation or Range Change 
Add 0.02% of range/°C to the DC voltage accuracy. 
Active Power Accuracy
Requirements  same at the conditions for voltage and current Power factor  
Accuracy 
 
When the Line Filter is Turned ON 
 
Temperature coefficient  same as the temperature coefficient for voltage and current  
Accuracy when the crest factor is set to 6 or 6A  accuracy obtained by doubling the measurement range error for the accuracy when the crest factor is set to 3  
Accuracy of apparent power S  voltage accuracy + current accuracy  
Accuracy of reactive power Q  accuracy of apparent power + (√1.0004  λ2)  (√1  λ2) ×100 %  
Accuracy of power factor λ  ± [(λλ/1.0002)+丨 cosøcos{ø+sin1 (influence from the power factor when λ = 0%/100)}丨] ±1 digit when voltage and current are at the measurement range rated input  
Accuracy of phase difference Φ  ± [丨 øcos1(λ/1.0002)丨+ sin1 (influence from the power factor when λ = 0 % / 100)] ± 1 digit when voltage and current are at the measurement range rated input  
Accuracy changes caused by data update interval  When the data update interval is 100 ms, and Auto, add 0.05% of reading to the 0.1 Hz to 1 kHz accuracy.  
Influence of Power Factor  When power factor (λ) = 0 (S: apparent power) ± 0.1 % of S for 45 Hz ≤ f ≤ 66 Hz ± {(0.1 + 0.15 × f) % of S } for up to 100 kHz as reference data •f is frequency of input signal in kHz when 0 < λ < 1 (Φ: phase angle of the Voltage and current) (power reading ) × [(power reading error%) + (power range %) × (power range / indicated apparent power value) + {tanΦ × (influence when λ=o)%}] 
Voltage, Current and Active Power Measurements
Measurement method  Digital sampling method  
Crest factor  3 or 6 (6A)  
Wiring System  SinglePhase, TwoWire (1 P2 W)  
Range Select  Select Manual or Auto Ranging  
Auto range 
 
Display Mode Switching  Vrms (the true RMS value of voltage and current) VOLTAGE MEAN (the rectified mean value calibrated to the RMS value of the voltage and the true RMS value of the current) AC DC  
Measurement synchronization source  Select voltage, current, or off In the case of Auto Update Rate, select the voltage or current from the equipped element.  
Line filter  Select OFF or ON (cutoff frequency at 500 Hz).  
Peak measurement  Measures the peak (max, min) value of voltage, current or power from the instantaneous voltage, instantaneous current or instantaneous power that is sampled.  
Zerolevel compensation  Removes the internal offset of the measure unit (After measurement range is changed)  
Measurement Parameters 

Frequency Measurement
Measurement Frequency Range (Data Update Interval : Measurement Frequency Range) 
( * ) Limit of the measurement lower limit frequency by the Timeout setting  
Measurement Frequency Range (Timeout : Lower Limit Frequency) 
 
Measurement Range  Auto switching among six types: 100mHz, 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, and 100 kHz.  
Frequency Filter  Select OFF or ON (cut off frequency of 500 Hz)  
Accuracy 
± (0.06% of reading) 
Integration
Mode  Select manual integration mode, standard integration mode, or repetitive integration mode. 
Timer  Automatically stop integration by setting a timer. Selectable range: 0 hours 00 minutes 00 seconds to 9999 hours 59 minutes 59 seconds 
Accuracy  ±(Power accuracy (or current accuracy) + 0.1% of reading) (fixed range) 
Range Setting  Auto Range or Fixed Range is Available for Integration 
Timer Accuracy  ±0.02% 
Remote control  Start, stop and reset operations are available using an external remote signal. (option) 
Harmonic Measurement
Measured Item  Voltage, Current, Power  
Measured Method  ZeroCross Simultaneous Calculation Method  
Frequency Range  10 Hz to 1.2 kHz.  
FFT data length  1024 4096 (Auto switch when both 50Hz/60Hz and update rate > 0.1s conditions are met)  
Sample rate, window width, and upper limit of Analysis orders* 
 
Accuracy 

*50Hz/60Hz Compliant IEC6100047
D/A Output (options)
Output voltage  ±5 V FS (approach ±7.5 V maximum) against each rated value. 
Number of output channels  4 
Output items  Set for each channel : V, I, P, VA, VAR, PF, DEG, VHZ, IHZ, Vpk, Ipk, WP, WP±, q, q±, Off 
Accuracy  ±(accuracy of each measurement item + 0.2% of FS) (FS = 5 V) 
D/A conversion resolution  16 bits 
Minimum load  100 kΩ 
Update Interval  Same as the data update interval. In the case of Auto Update Rate, update interval is equal to signal interval. More than 100ms. 
Temperature coefficient  ±0.05%/°C of FS 
Remote Control Input/Output Signal (Options)
Remote Control Input Signal  EXT HOLD, EXT TRIG, EXT START, EXT STOP, EXT RESET 
Remote Control Output Signal  INTEG BUSY 
I/O Level  TTL 
I/O Logic Format  Negative Logic, Falling Edge 
Digital IO Signal (options)
I/O Control Output Signal  OUT1, OUT2, OUT3, OUT4 
I/O Level  TTL 
I/O Sink Current  Max 100mA (per/ch) 
* Q (VAR), S (VA), λ (PF) and Φ (DEG) are originated from the measured values including voltage, current and active power which go through computation process. In respect to distorted signal input, accordingly, the value acquired from other instruments, which employ different methods, may differ from that acquired from GPM8310 unit.
* “Zero” will be shown for S or Q and ““ will be displayed for λ and Φ when either current or voltage is less than 0.5% of the rated range (less than or equivalent to 1% when crest factor is set 6).
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