To Test Time Measurement Accuracy; Equivalent Time Mode Procedure - Agilent Technologies 54845B Manual

Chapter 3: Testing Performance

To test time measurement accuracy

To test time measurement accuracy

This test uses a precise frequency source to check the accuracy of time measurement functions.
Specification Delta-t accuracy
Equivalent Time: (≥16 averages)
±[(0.007% × delta-t) + (full scale/(2 × memory depth))+ 30 ps]
Real Time: * ±[(0.007% × delta-t) + (0.2 × sample period)]
* The specification applies to bandwidth limited signals (tr ≥ 1.4 × sample period).
The sample period is defined as 1/(sample rate). The specification also applies to those
automatic measurements computing time intervals on identical slope edges
(like pos-pos, neg-neg).
Equipment Required
Equipment
Signal Generator
RF Amplifier
Cable
Cable
Adapter
The Agilent 8447D RF Amplifier is used as a saturation amplifier to create a very low-jitter
squarewave from the sinewave output of the signal generator. You adjust the signal generator
output level to change the risetime of the squarewave.

Equivalent Time Mode Procedure

This test checks time measurement in equivalent time mode with averaging.
Set the Agilent 8664A signal generator for a 40-MHz sine wave (25.0 ns period) at
1
250 mV .
rms
Connect the output of the signal generator to the INPUT of the Agilent 8447D RF
2
amplifier.
Connect the OUTPUT of the RF amplifier to the channel 1 input of the oscilloscope.
3
Press Default Setup to set the oscilloscope to default conditions.
4
Press Input to select 50 Ω. Press Coupling to select dc.
5
Press Autoscale.
6
Set the vertical scale to 500 mV per division.
7
3–16
Critical Specifications
1-100 MHz,
timebase accuracy - 0.25 ppm
40 MHz to 1 GHz, 20 dB gain
Type-N 24 inch
BNC
Type N (f) to BNC (m)
Recommended Model/Part
Agilent 8664A
Agilent 8447D
Agilent 11500B
Agilent 10503A
Agilent 1250-0077