Front Panel Operation
2-15
• Between 50 and 100Hz, use either mode.
• Above 100Hz, use normal RMS mode for its greater
speed.
AVERAGE:
When this item is selected, the signal path in
the instrument bypasses the RMS converter, and the average
ACV measurement is the filtered output of a full wave
rectifier.
PEAK:
For AC peak measurements, the instrument displays
the largest peak (positive or negative) of the input signal. The
measurement window is fixed at 100msec.
Note that you can configure the resolution of ACV peak mea-
surements from 4 digits (3.5d from SET ACV RESOLU-
TION menu) to 9 digits (8.5d), but the accuracy is specified
at 4 digits. In addition, the accuracy specifications for AC
peak measurements assume AC+DC coupling below 200Hz.
POSITIVE-PEAK and NEGATIVE-PEAK:
Peak spike
measurements are available as an ACV primary display (top
line). They are also available as a DCV multiple display (bot-
tom line). The menu items POSITIVE-PEAK and NEGA-
TIVE-PEAK enable the measurement as a primary display.
See Figure 2-4 for a description of the primary display.
After selecting a positive or negative peak spikes measure-
ment from the SET ACV MEASUREMENT menu, you are
asked to enter a value for the measurement window. A typical
message follows:
PEAK WINDOW = 0.1 s
This sets the time the signal is sampled before the display is
updated with a new reading. It can range from 0.1sec to
9.9sec.
As a primary display, the resolution of peak spikes can be set
from 3.5d to 8.5d, but the accuracy is specified at 3.5d. (As a
multiple display, the resolution is fixed at 3.5d.)
Note that dB and dBm are not allowed as valid units for peak
spikes. Positive-going spikes on a negative DC level could
still read as a negative value, and the log of a negative num-
ber is not defined.
Multiple displays
The displays for DC and AC voltage that show multiple func-
tions are shown in Figures 2-5 and 2-6. The multiple display
for crest factor, which is calculated from the peak and RMS
values, is described here.
Figure 2-4
Positive and negative peak spikes
RANGE = Set by ACV range (auto or fixed).
REL = Operates normally.
SPEED = Set by peak window (0.1-9.9sec).
FILTER = Set by ACV filter (AUTO=ADV (10)).
RESOLUTION = Set by ACV resolution (AUTO = 3.5d).
UNITS = Fixed on volts.
COUPLING = Set by ACV coupling.
+000.0 mVAC
+Pk
Coupling: AC+DC
NOTES:
1. Positive peak spikes and negative peak spikes are selected
in the CONFIGURE-ACV menu.
2. Peak spikes measurement is specified for volts at 3.5 digits.
3. “Peak window” is the time a signal is sampled before a
reading is displayed.
Summary of Contents for 2002
Page 123: ...Front Panel Operation 2 106...
Page 145: ...IEEE 488 Reference 3 22...
Page 167: ...IEEE 488 Reference 3 44...
Page 284: ...A Specifications A 1...
Page 362: ......
Page 364: ...This page left blank intentionally...
Page 365: ......