HP 34401A, User Manual

Page: 220 / 236

Frequency and Period Characteristics
Frequency and Period
Measurement Method:
Voltage Ranges:
Gate Time:
Reciprocal-counting technique.
AC-coupled input using the
ac voltage measurement function.
100 mV rms full scale to 750 V rms.
Auto or manual ranging.
10 ms, 100 ms, or 1 sec
Settling Considerations
Errors will occur when attempting to measure the frequency or
period of an input following a dc offset voltage change. The input
blocking RC time constant must be allowed to fully settle ( up to
1 sec ) before the most accurate measurements are possible.
Measurement Considerations
All frequency counters are susceptible to error when
measuring low-voltage, low-frequency signals. Shielding
inputs from external noise pickup is critical for minimizing
measurement errors.
Measuring Characteristics
Function
Frequency,
Period
6 1
⁄
2
5
1
⁄
2
4 1
⁄
2
1
9.8
80
System Speeds
[ 5 ]
Configuration Rates
Autorange Time
ASCII readings to RS-232
ASCII readings to HP-IB
Max. Internal Trigger Rate
Max. External Trigger Rate to Memory
Max. External Trigger Rate to HP-IB/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 6
1
⁄
2
digits.
[ 2 ]
Relative to calibration standards.
[ 3 ]
20% overrange on all ranges, except 750 Vac range.
[ 4 ]
Input > 100 mV.
For 10 mV input, multiply % of reading error x10.
[ 5 ]
Speeds are for 6
1
⁄
2
digits, Delay 0, Display OFF,
and Fast AC filter.
Operating Characteristics
[ 5 ]
Digits
Reading/s
8
Chapter 8 Specifications
221