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The GW Instek GPM-8320 and GPM-8330 are digital power meters designed specifically for measuring power in three-phase AC power sources. The GPM-8320 provides two input modules and the GPM-8330 provides three modules, supporting most electrical and electronic product testing applications. Both models feature a testing bandwidth of DC and 0.1 Hz to 100 kHz, 16-bit A/D converters, a sampling rate of 300 kHz, and a 5-inch TFT LCD display with 5 digits of measurement readings.
According to the datasheet, the GPM-8320/8330 are suited for electrical and electronic product testing applications across research and development, design, and quality verification. The instruments support measurement of voltage, current, frequency, active power, apparent power, reactive power, power factor, crest factor, total harmonic distortion, maximum current ratio, and integration of power or current over time. Harmonics measurement complies with IEC 61000-4-7 requirements at 50/60 Hz, with analysis up to the 50th order.
The GPM-8320 and GPM-8330 share the same digital power meter platform, measurement architecture, and feature set. The differentiator between the two models is the number of input modules: the GPM-8320 provides two modules, and the GPM-8330 provides three modules. Both models support the same wiring configurations (1P3W, 3P3W, 3P4W, 3V3A), the same measurement bandwidth (DC and 0.1 Hz to 100 kHz), the same 16-bit A/D conversion at 300 kHz sample rate, and the same ±0.1% reading ±0.05% range accuracy.
Module count determines which wiring configurations each model can execute and how many phases can be measured simultaneously. Per the datasheet wiring-selection table, the GPM-8320 supports 1P3W only, while the GPM-8330 supports 1P3W, 3P3W, 3P4W, and 3V3A. For three-phase three-wire or four-wire measurements, the GPM-8330 is the required configuration.
Each new GPM-8320 or GPM-8330 below is its own dedicated product page with condition-matched pricing. Select the model that matches the number of input modules and wiring configurations your application requires.
The two-model versus three-model decision is driven by the wiring configuration of the device under test. Single-phase three-wire (1P3W) testing can be performed by either the GPM-8320 or the GPM-8330. Three-phase three-wire (3P3W), three-phase four-wire (3P4W), and three-voltage three-ammeter (3V3A) configurations require the GPM-8330's three input modules. The comparison table below shows the specific module count and wiring support for each model.
All other specifications — measurement bandwidth, accuracy, harmonic analysis to the 50th order, integration timer range, internal memory depth, display modes, and standard communications interfaces — are identical across both models. The optional GPM-DA12 GPIB + Digital I/O interface is available as a factory-installed option on both.
| Model | Modules | Test Bandwidth | Standard Interface |
|---|---|---|---|
| GPM-8320 | 2 | DC, 0.1 Hz to 100 kHz | RS-232C, USB Device/Host, LAN |
| GPM-8330 | 3 | DC, 0.1 Hz to 100 kHz | RS-232C, USB Device/Host, LAN |
| GPM-8330 | 3 | DC, 0.1 Hz to 100 kHz | RS-232C, USB Device/Host, LAN |
Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
GW
Condition
New
Manufacturer
Instek
30+ Years in Business
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30+ Years in Business
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Sell Test Equipments
Knowledgeable Staff
On-site Lab
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