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RATE (Frequency) Measurements-continued |
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 3.3.1
RATE (Frequency) Measurements (Cont'd)
A. Readout
The frequency mode of operation displays the count of the input signal repetitions measured over
the gate time. The selection of the proper gate time (see applications Section I) therefore enables
displaying directly in Hz, KHz or by use of normalizing techniques, any desired engineering units
(i.e. RPM, Ft/sec., etc.). Because of the variety of display units possible, there is no automatic
decimal point in this display and the proper location for the decimal point must be determined by
the operator (see paragraph 3.2.2 for examples).
B. Gate Time Setting
The thumbswitches and multiplier (X1, X10, X100 and X1000) determine the duration of the
counting gate. The gate time is always in seconds as indicated below. The multiplier merely
serves to move the decimal point for extending the range of values. For example, when
measuring frequency directly, it is desirable to have the time base set for one second or decimal
factors of one second, as readings are then directly in Hz. Typical settings are as follows:
Thumbswitch
Multiplier
Display
Gate Time
.100000
X1
XXXXXX Hz
1
sec
.100000
X10
XXXXX.X Hz
10
sec
.100000
X100
XXXX.XX Hz
100
sec
.100000
X1000
XXX.XXX Hz
1000
sec
.010000
X1
XXXX.XX KHz
.1
sec
.010000
X10
XXXXXX Hz
1
sec
.010000
X100
XXXXX.X Hz
10
sec
.010000
X1000
XXXX.XX Hz
100
sec
.001000
X1
XXXXX.X KHz
.01
sec
.001000
X10
XXXX.XX KHz
.1
sec
.001000
X100
XXXXXX Hz
1
sec
.001000
X1000
XXXXX.X Hz
10
sec
.000100
X1
XXX.XXX MHz
.001
sec
.000100
X10
XXXXX.X KHz
.01
sec
.000100
X100
XXXX.XX KHz
.1
sec
.000100
X1000
XXXXX Hz
1
sec
3-2
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