Keithley 776 Counter
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is a ten digit microprocessor based
fully-programmable. three-channel Universal Counter
The instrument measures with a very high resolution and
precision the following parameters: Frequency A. Frequency
B. Frequency C. Period A. Pulse-width. Time interval A to B.
Total counts B. Ratio A/B. Ratio C/B. Phase A to B and
Amplitude peaks. An averaging function is available for
improved resolution in time measurement: resolves intervals
of pico seconds. Various repetitive tests, no matter how
complex, are greatly simplified by utilizing any of the 10
pre-programmed front panel set-up. Set-ups are stored in a
non-volatile memory' and can be recalled by a simple key stroke.
utilizes a combination of two measurement
techniques in order to always achieve maximum display
resolution. Some functions, such as Frequency measurement
function, can be displayed with up to ten digits. Such
resolution can be gained from frequencies
as low as 0.01 Hz to more than 225 MHz. The reciprocal
technique is being used in low frequency measurements, up to
exactly 120 MHz, where the measurement technique is changed
to conventional measurement technique. model 776
frequencies of input signals with minimum resolution of nine
digits in one second of gate time. With the TCXO time base
of the Model 776/2.4G. the displayed result in largely
enhanced, both in terms of stability and accuracy.
In model 776
. the traditionally featured decade steps of
gale times, are replaced by a more flexible variable gate
time. This feature permits a choice from 500 internally
pre-selected gale intervals, or am external gate interval
which is applied to a rear panel BNC connector. Internal
gate times range from 100 µs to 10 s. External gate expands
this range to 1000 s. Trigger level may be selected manually
or left to be automatically adjusted, by the instrument, to
the optimum level, thus eliminating false triggering on
Service and User Manual
6.29 Mbytes (6598466 Bytes)
01 April 2001
Scanned document, all readable.
25 August 2018
This manual provides operating and maintenance information
for the model 776
Programmable Counter/Timer. Section 1 is a
general description of the instrument. Section 2 and 3
obtain installation and operating instructions. IEEE
programming is explained in Section 4. Maintenance and
performance checks are provided in Section 5. The theory of
operation is described in Section 6. Section 7 outlines
calibration and troubleshooting procedures. Section 8
contains tables of replaceable parts. Section 9 contains
schematic and component location diagrams.