Tips for Getting the B est A ccur acy
The Models HHM73 and HHM76 are capable of measuring DC to 10KHz
currents over a wide range. Here are some key considerations for getting
the most accuracy from your display instrument:
·
When using the Models HHM73 and HHM76 with an oscilloscope, it is
important to select the range that provides the best resolution.
·
Make sure that probe jaw mating surfaces are free of dust and
contamination.
·
Beware of short-circuit currents. Large in-rush DC currents (which can
occur when power is first applied in a circuit) and large high-current
transients may cause varying degrees of residual readings. If in doubt
of a particular reading, remove the probe from the conductor under test
and check to see that the display device returns to zero. If not, it will be
necessary to rezero the probe.
HHM73 Specs
Cont.
Noise:
60 A Range:
DC to 1 kHz
£
8 mV
DC to 5 kHz:
£
12 mV
0.1 Hz to 5 kHz:
£
2 mV
600 A Range:
DC to 1 kHz
£
1 mV
DC to 5 kHz:
£
1.5 mV
0.1 Hz to 5 kHz:
£
500µV
Rise and Fall Time:
60 A Range:
£
100µs from 10 to 90% Vout
600 A Range:
£
70µs from 10 to 90% Vout
MECHANICAL
Humidity Influence:
10 to 90% RH @ reference
temperature
£
0.5%
Maximum Cable Diameter:
One 1.18" (30 mm) or two 0.95"
(24 mm) or two bus bars 1.2 x
0.4" (31.5 x 10 mm)
Dimensions:
8.8 x 3.82 x 1.73"
(224 x 97 x 44 mm)
Weight:
15 oz (440 g)
HHM76 Specs
Cont.
Overload:
3000 A DC and 2000 A
AC continuous up to 1 kHz
Noise:
150 A Range:
DC to 1 kHz:
£
8 mV
DC to 5 kHz:
£
12 mV
0.1 Hz to 5 kHz:
£
2 mV
1500 A Range:
DC to 1 kHz:
£
1 mV
DC to 5 kHz:
£
1.5 mV
0.1 Hz to 5 kHz:
£
500µV
Rise and Fall Time:
150 A Range:
£
100µs from 10 to 90% Vout
1500 A Range:
£
70µs from 10 to 90% Vout
MECHANICAL
Humidity Influence:
10 to 90% RH @ reference
temperature
£
0.1%
Maximum Cable Diameter:
One 1.5" (39 mm) or one bus bar
1.96 x 0.49 (50 x 12.5 mm) or
two 0.98" (25 mm) or two bus
bars 1.96 x 0.19" (50 x 5 mm)
Dimensions:
9.31 x 3.82 x 1.73"
(236.5 x 97 x 44 mm)
Weight:
16 oz (480 g)
16
5
