4.4.19 REF
IN
1REF OUT
Ref
ln
Use the
RefIn
connector to accept a 10 MHz external reference. The Model395 detects
the external reference signal and automatically switches from the internal reference to
the external reference. The reference must be 10
± 0.5 MHz, l Vp-p to 10 Vp-p (50 Vdc
max.)
40%
to
60%
duty-cyc1e
square
wave
or
bipolar
sine
wave
signaIs.
Input
impedance is >
lill
(ac coupled). There are no front panel screens orremote commands
to control the reference input.
Ref Out
The
reference output supplies a buffered 10
MHz
TTL
internaI system c10ck output.
Also, tbis connectorcan supply a buffered reference output with an
externaIl
0
MHz
dock
connected
ta
REl'
LN.
Output signaIlevel is approximaldy 1.5 V
p-p
illto
son.
Front Panel Operation Reference 4-79
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