Key facts
- Brand
- EXTECH
- Model
- 400A
- Category
- Other Electronics
- Documents
- 10
- Languages
- EN
- Last added
- 2026-10-03
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EXTECH 400Amp True RMS AC/DC Clamp Meter with IR Thermometer Model EX623 user manual
The Extech EX623 is a heavy-duty multimeter featuring dual input thermocouple temperature measurement, non-contact IR temperature sensing, and non-contact voltage detection. It measures AC current up to 400A, DC current up to 400A, AC/DC voltage up to 600V, resistance, capacitance, frequency, duty cycle, and continuity.
Read onlineEXTECH 400A specifications
| Fc Range | 40, 400, 4000, 40.00kFc |
|---|---|
| Lux Range | 400, 4000, 40k, 400kLux |
| Accuracy | ±5% rdg |
| Max Resolution | 0.01Fc/0.1Lux |
| Datalogging (HD450) | 16,000 continuous readings; 99 selected readings |
| PC Interface | USB |
| Dimensions | 6.7 x 3.1 x 1.6 in (170 x 80 x 40 mm) |
| Weight | 13.7 oz (390 g) |
Source: Extech HD400 and HD450 Heavy Duty Light Meters Product Leaflet
All EXTECH 400A documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
- EXTECH 400Amp True RMS AC/DC Clamp Meter with IR Thermometer Model EX623 user manual 15 p
- Extech CA250 400A AC/DC Current Clamp-on MultiMeter Adaptor User's Guide 1 p
- Extech MA200 AC Clamp Meter User's Guide 8 p
- EXTECH 400Amp AC Clamp Meter + NCV Model MA410 user manual 10 p
- EXTECH 400Amp True RMS AC Clamp Meter with IR Thermometer Model EX622 user manual 15 p
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
How many readings can the HD450 store?
The HD450 can automatically store up to 16,000 continuous readings and manually store or recall up to 99 selected readings.
From: Extech HD400 and HD450 Heavy Duty Light Meters Product Leaflet
What is the measurement accuracy of the HD400 and HD450 meters?
Both meters provide an accuracy of ±5% of the reading.
From: Extech HD400 and HD450 Heavy Duty Light Meters Product Leaflet
What is the maximum current measurement range?
The meter supports a maximum input of 400A for both AC and DC current measurements.
From: EXTECH 400Amp True RMS AC/DC Clamp Meter with IR Thermometer Model EX623 user manual
How do I perform a zero function for DC current?
Select ADC mode with no conductor in the jaw, then press and hold the MODE ZERO button until two beeps are heard.
From: EXTECH 400Amp True RMS AC/DC Clamp Meter with IR Thermometer Model EX623 user manual
What is the output sensitivity for the 0 to 40A range?
The output is 10mV/Amp on the 0 to 40A range.
From: Extech CA250 400A AC/DC Current Clamp-on MultiMeter Adaptor User's Guide
What is the output sensitivity for the 0 to 400A range?
The output is 1mV/Amp on the 0 to 400A range.
From: Extech CA250 400A AC/DC Current Clamp-on MultiMeter Adaptor User's Guide