2635A
Users Manual

2-12

Configuring a Channel to Measure Frequency

Perform the procedure in Figure 2-7 to configure a channel for measuring frequency. In

preparation, the instrument must be in the inactive mode (not scanning or monitoring)
and the desired channel must be selected (see Figure 2-3). To exit at any time (changes
not saved), press the C key.
Restrictions

Frequency Range. The frequency range for measurements is 15 Hz minimum to greater

than 1 MHz.

Maximum Input. The maximum voltage inputs are 300V ac (rms) for channels 0, 1, 11,

and 150V ac (rms) for channels 2 to 10, and 12 to 20. The frequency range for maximum

voltage inputs is 15 Hz to 100 Hz. Refer to Appendix A for derated voltage inputs for

frequencies between 100 Hz and 100 kHz.

FUNC
ENTER
SET FUNC
OFF
°F [°C]*
Hz
Ω
VAC
V DC
Auto
1.0000 MHz
900.00 kHz
90.000 kHz
9.0000 kHz
900.00 Hz
ENTER
SET FUNC
Typical
Required
Selecting the Frequency Mode. Press the
FUNC key to access the SET FUNC (Set
Function) menu. Press the up/down arrow keys
until Hz (Hertz) is displayed, then press the
ENTER key.
Selecting the Measurement Scale. Select a
fixed scale or Auto (autoranging). A fixed scale
indicates an upper measurement limit. For
example, the 90.000 kHz scale measures 90 kHz
or less. Measurements beyond the scale limit will
cause an OL (overload) display. The x1 (unity or
x 1) multiplier indicates a reading in Hz; the k
(kilo or x 1,000) multiplier indicates a reading in
kilohertz; the M (mega or x 1,000,000) multiplier
indicates a reading in megahertz.
In Auto (autoranging), the instrument chooses the
scale for the best measurement resolution.
There are no scanning delays with frequency
autoranging.
* Depends on
temperature scale.
op19f.eps
Figure 2-7. Configuring a Channel to Measure Frequency