Using An External 10 Mhz Clock - Fluke 5520a Operator's Manual

Using an External 10 MHz Clock

The Calibrator uses an internal 10 MHz clock
signal as a reference for all ac functions. Although
this internal clock is very accurate and stable, you
may have a lab standard that you want to have
govern the frequency performance of the
Calibrator. To apply an external clock to the
Calibrator, you have two choices. You can make
external reference the power-up and reset default
condition, or you can select external reference as
a volatile setting for the operating session only.
To make external reference the power-up and
reset default setting, proceed as follows:
1. Connect a 10 MHz squarewave signal of 5 V
p-p (maximum) to the rear panel 10 MHz IN
BNC connector.
Press the S key.
2.
3. Press the following sequence of softkeys:
INSTMT SETUP, OUTPUT SETUP, φ & REF
SETUP.
4. Press the REF CLK softkey to select "ext."
Press the Pkey.
5.
6. To use an external 10 MHz reference on a
temporary (volatile) basis, proceed as follows:
7. Connect a 10 MHz squarewave signal of 5 V
p-p (maximum) to the rear panel 10 MHz IN
BNC connector.
8. Set the Calibrator output to an ac voltage or
current function.
83