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Chapter 4
Connecting Current Loop Inputs to High Voltage Channels
High voltage channels on the DT9873 and DT9874 instruments have an input range of ±10 V,
±100 V, or ±400 V. You select the input range for each channel using software.
Note: On older versions of the instrument, the input range was fixed and depended on the
model you purchased.
With the 24-bit A/D converter, high current, high side current shunts can be used for
resolutions of less than 0.01 A on a 100 A range.
Typical Shunts:
• Vishay WSMS5515
• Vishay CSM2512S
• Deltec MUB-500-50
Notes: The resolution is ±2 mV on a ±100 V range and ±0.3 mV on the ±10 V range. Since the
resolution of the ±400 V range is ±8 mV, using current loop inputs with this range is
impractical in most applications.
On the standard DT9874 instrument, channels 32 to 47 correspond to the high voltage input
channels.
Figure 18
range.
56
.2 mΩ - 2W - 100A - 20mV
10 mΩ - 1W - 10A - 100mV
.1 mΩ - 25W - 500A - 50mV
shows an example of wiring signals to measure ±20 mA using the ±10 V input
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