Time Electronics User Manual
9780 Clamp Meter Adaptor v1.2
9780 Clamp Meter Adaptor Page 10 of 12
3 Specifications
Maximum Current: 22 A.
Current loops: 2 provided: a 1 to 1 ratio and a 50 to 1 ratio.
The above specification applies for use with general purpose clamp meters such as the
Fluke 801-1000 or LEM LH1020.
Maximum allowed primary current: 22 A RMS. The frequency range is 45 to 90 Hz.
Series resistance: 1 turn coil = approximately 1 mΩ.
50 turn coil = 0.11 Ω. Inductance = 1 mH.
Operation ratings and Duty Cycle:
The 9780 is rated for continuous operation at 10 A.
At 22 A the duty cycle should be a maximum of 3 minutes on and 6 minutes off.
Operational Warning:
It is possible if the duty cycle is exceeded, the coils can become hot to the touch.
Maximum drive voltage: 3 V DC or 3 V RMS AC.
Dimensions / Weight: W 240 x D 280 x H85 mm / 3.9 kg.
Supplied with: High current test lead set (part # 9503).
NOTE: When used with older style clamp meters where substantial operating power is required it should be
noted that additional power is required from the current source.
For example a 1000 A Ferranti clamp-on ammeter requires at least 50 % more power from the current source.
This will require increased power transfer through the clamp meter adaptor and therefore the on to off time
should be increased to 1 to 10 ie 1 minute on and 10 minutes off.
Calibrator
Output
Freq Amp Turns
Accuracy
(% of output)
plus Floor
(Amps)
0.2 A to 2.2 A DC 10 - 110 0.5 0.05
2.2 A to 22 A DC 110 - 1100 0.5 0.15
0.2 A to 2.2 A 45 to 65 Hz 10 - 110 0.5 0.2
0.2 A to 2.2 A 65 to 90 Hz 10 - 110 1 0.25
2.2 A to 22 A 45 to 65 Hz 110 - 1100 0.5 0.7
2.2 A to 22 A 65 to 90 Hz 110 - 1100 1 0.9
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