Operation
DA1855A-OM-E Rev A
ISSUED: July 2002
3-11
Table 3-2. V
DIFF
Range for Different Gain and Attenuator Settings
When using readout encoded probes which the DA1855A
senses, the PVG readout calculates the effective differential
offset at the probe tip. Of course, both probes must have the
same attenuation factor.
In the
V
COMP
mode, the maximum
OFFSET VOLTAGE
input is
limited by the DA1855A common mode dynamic range. In the
V
DIFF
mode it is limited by the dynamic range of the internal
V
DIFF
amplifier.
Tables 3-3 and 3-4 will help the operator stay within the maximum
input voltage limits and understand the relationship between the
actual voltage applied and the effective voltage. Effective voltage
is always referred to the input of the DA1855A or the probe tip if a
probe is used. When using probes, the maximum effective
voltage range may be limited by the maximum voltage rating of
the probe.
Table 3-3. Effective Offset Range with
÷1
÷1
Probe
Gain
Attenuation
Max. V
DIFF
X1
÷÷
1
± 10 V
X1
÷÷
10
± 100 V
X10
÷÷
1
± 1 V
X10
÷÷
10
± 10 V
Front panel
Settings
Effective Offset
Range
Gain
Attenuation
V
COMP
V
DIFF
X1
÷÷
1
± 15.5 V
± 10 V
X1
÷÷
10
± 155 V
± 100 V
X10
÷÷
1
± 15.5 V
± 1 V
x10
÷÷
10
± 155 V
± 10 V
