Frequency and Period Characteristics
Frequency and Period
Measurement Method:
Voltage Ranges:
Gate Time:
Reciprocal-counting techn ique.
AC-coupled input using the
ac voltage measurement function.
100 mV rms full scale to 750 V r ms.
Auto or manual ranging.
10 ms, 100 ms, or 1 sec
Settling Considerations
Errors will occur when at temp t ing t o me as ure th e fr eq ue ncy o r
period of an input followi ng a dc of fs et v ol t ag e chan ge . The i np ut
blocking RC time constant must be a llowed to fully settle ( up to
1 sec ) before the mos t accurate measurements are possible.
Measurement Considerations
All frequency counters are susceptible to error when
measuring low-voltage, low -frequency signals. Shield ing
inputs from external noise pickup i s critical for minimizing
measurement errors.
Measuring Characteristics
Function
Frequency,
Period 61⁄2
51⁄2
41⁄2
1
9.8
80
System Speeds [ 5 ]
Configuration Rates
Autorange Time
ASCII readings to RS-232
ASCII readings to GPIB
Max. Internal Trigger Rate
Max. External Trigger Rate to Memory
Max. External Trigger Rate to GPIB/RS-232
14/sec
<0.6 sec
55/sec
80/sec
80/sec
80/sec
80/sec
[ 1 ] Specifications are for 1-hour warm-up at 61⁄2 di gits.
[ 2 ] R elative to calibration standards.
[ 3 ] 20 % overrange on all ranges, except 750 Vac range.
[ 4 ] In put > 100 mV.
For 10 mV to 100 mV inputs, multiply % of reading
error x10.
[ 5 ] Speeds are for 41⁄2 digits, Delay 0, Display O FF,
and Fast AC filter.
Operating Characteristics [ 5 ]
Digits Reading/s
8
Chapter 8 Specifications
221