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19
Operation mode selector. Blue text corresponds to blue text at TIME BASE/
MULTIPLIER switch.
Positions:
SUB-UNIT
COUNT A
RATIO A/B
PERIOD A
PERIOD AVG A
TL. ATOB
T.l. AVG ATOB
FREQ. A
FREQ. C
CHECK
DISPLAY TEST
Matches counter to sub-unit used.
Sets counter to totalize or scaling mode (see also con-
trols 5 "and 6). Signal applied to INPUT A is scaled by a
factor 1 to 10? as set with MULTIPLIER
switch. Scaled
signal available at rear TIME BASE OUT connector. Fre-
quency range in totalize mode 0 to 160 MHz, in scaling
mode 0 to 10 MHz.
Used when measuring ratio of frequency A (0 to 160 MHz)
applied at INPUT A to frequency B (0 to 10 MHz) applied
at INPUT B.
Sets counter to measure single period applied at INPUT
A. Desired resolution 10 ns to 1 s is set with TIME BASE
switch. Frequency range 0 to 10 MHz.
Sets
counter
to measure
period
of signal
applied
at
INPUT A. MULTIPLIER switch sets number of periods (1
to 108) to be averaged. Frequency range 0 to 10 MHz.
Sets counter to measure time interval A to B, with start
signal at INPUT A and stop signal at INPUT B. TIME BASE
switch sets counted frequency (100 MHz to 1 Hz). Input
range is 40 ns to 10? s. Inputs A and B can be common
or separated. A deadtime of = 50 ns between interval is
required.
Sets counter to measure
average
interval A to B, with
start signal at INPUT A and stop signal at INPUT B. Input
range is 100 ps to 10 s, repetition rate 10 MHz. MULTI-
PLIER switch sets number
of intervals to be averaged
(1 to 108). A dead-time
of 2 50 ns between
intervals
is
required.
Sets counter to measure frequency of signal applied to
INPUT A. TIME BASE switch sets suitable gate time (100
ns to 100 s). See also 20. INPUT A.
Sets counter to measure frequency of signal applied to
INPUT C. TIME BASE switch sets suitable gate time (100
ns to 100 s). See also 18. INPUT C.
Used for self-check of internal logic circuits.
Counter displays 100 MHz
(derived from internal oscil-
lator) during gate time set with TIME BASE switch.
Used to check function of decimal points, measuring unit
display and character segments.
Each step up to 1 s of
TIME BASE/MULTIPLIER
switch provides one functional
test.
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