Front Panel Operation
2-13
RESOLUTION
Except for frequency, temperature, and some special cases of
AC voltage, all functions can operate with 3½ to 8½-digit
resolution, or they can default to a setting appropriate for the
selected integration time.
3.5d, 4.5d, 5.5d, 6.5d, 7.5d or 8.5d: Sets resolution to the
specified number of digits.
AUTO: optimizes the resolution for the present integration
time setting. See Table 2-10 for the default resolutions of the
DCV and ACV functions. The default resolutions of the
other functions are listed in Tables 2-15, 2-20 and 2-25.
UNITS
This parameter selects the displayed units for AC voltage
measurements.
VOLTS: With volts selected as the units, AC voltage mea-
surements are expressed in volts.
dB: Expressing AC voltage in dB makes it possible to com-
press a large range of measurements into a much smaller
scope. The relationship between dB and voltage is defined by
the following equation:
where: V
IN
is the AC input signal.
V
REF
is the specified voltage reference level.
Table 2-9
DCV and ACV auto filter
Measurement function
and type Units State Type Readings
Noise
tolerance
Averaging
Mode
DCV - On Advanced 10 1.0% Moving
DCV peak spikes - On Advanced 10 5.0% Moving
RMS, average, low fre-
quency RMS
Any Off Advanced 10 5.0% Moving
ACV peak Volts
dB, dBm
On
On
Advanced
Averaging
10
10
5.0%
–
Moving
Moving
dB
=
20
log
V
IN
V
REF
-------------
The instrument will read 0dB when the reference voltage
level is applied to the input. dB measurements are possible
on all ACV measurement types except positive peak spikes
and negative peak spikes, as these may be negative, and the
log of a negative number is not defined. Note that dB mea-
Table 2-10
DCV and ACV auto resolution
Measurement
function and type Integration time Resolution
DCV 0.01 to <0.02 PLC
0.02 to <0.10 PLC
0.10 to <1.00 PLC
1.00 to <10.00 PLC
10.00 to 50 PLC
4.5d
5.5d
6.5d
7.5d
8.5d
DCV peak spikes Not used 3.5d
RMS, average 0.01 to <0.02 PLC
0.02 to <10.00 PLC
10.00 to 50 PLC
4.5d
5.5d
6.5d
Low frequency RMS Not used 5.5d
ACV peak Not used 4d
Notes:
1. If the DCV resolution is AUTO and the integration time SET-BY-
RSLN, the resolution will be 7.5 digits and the integration time 1.0
PLC.
2. For DCV peak spikes, low frequency RMS, and ACV peak measure-
ments, the integration time setting is ignored.
3. For RMS and average measurements, if the resolution is AUTO and the
integration time is SET-BY-RSLN, the resolution will be 5.5 digits and
the integration time 1.0 PLC.
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