System Switch/Multimeter User's Manual Section 5: Basic Digital Multimeter (DMM) O
-900-01 Rev. A / August 2007 5
DCV input divider
Normally, the input resistance for the 100mVDC, 1VDC, and 10VDC ranges is >10GΩ, while the
input resistance of the 100VDC and 300VDC ranges is 10MΩ. However, the input resistance for
the three lower DCV ranges can also be set to 10MΩ by enabling the input divider.
With the input divider enabled, the measurement INPUT HI is connected to INPUT LO. Also,
some external devices (such as a high voltage probe) must be terminated to a 10MΩ load. The
input divider maintains the measurement of open leads near 0V. Also, internal I
BIAS
through the
10M causes an open input to read <-4.4mV. With a short circuit (and the input divider on or off),
the short circuit to read < V.
The input divider can be enabled from the front panel when function is "dcvolts" by pressing the
CONFIG key, then the DMM key. To control the divider over the bus, use the dmm.inputdivider
remote programming command.
Connections
WARNING Even though the Series 3700 can measure up to 300V, the maximum input
to a switching module may be less. Exceeding the voltage rating of a
switching module may cause damage and create a safety hazard.
To Next Page
Loading...
Need help?
General
