24 Agilent U1251A/U1252A User’s and Service Guide
1 Getting Started Tutorial
The secondary display signs are described below.
The analog bar graph likens the needle on an analog meter,
except without the overshoot being displayed. When measur-
ing peak on null adjustments and viewing fast- changing
inputs, the bar graph provides useful indication because it
has faster update rates for fast response application.
The bar graph is not used for square wave output, frequency,
duty cycle, pulse width, 4–20 mA% scale, 0–20 mA% scale
and temperature measurements. When frequency, duty cycle
and pulse width are indicated on the primary display during
voltage or current measurement, the bar graph represents
the voltage or current value. When 4–20 mA% scale or 0–20
mA% scale is indicated on the primary display, the bar
graph represents the current value.
LCD Sign Description
AC + DC
DC
AC
Polarity, digits and decimal points for secondary display
kHz Frequency units: Hz, kHz
No ambient temperature compensation, just thermocouple measurement
ºC Celsius ambient temperature unit
ºF Fahrenheit ambient temperature unit
mV Voltage units: mV, V
µmA
Current units:
μA, mA, A
s Elapsed time unit: s (second) for Dynamic Recording and 1 ms Peak Hold modes
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