Operating instructions

University of Saskatchewan
Electrical Engineering Laboratory Equipment Manual
If I want a 100 KHz BW which is 10 KHz / div.
100 KHZ (nyquist) X 2 = 200 KHz sample rate
nearest higher sample rate 250 KS/s
Nyquist = 250 KHz / 2 = 125 KHz BW
125 MHz / 10 div = 12.5 KHz / div
freq. resolution = 12.5 kHz / 50 = 250 Hz.
Agilent 54621D Mixed – Signal Oscilloscope
The 54621D is a combination oscilloscope and logic analyzer. The digital section on the
front panel is the logic analyzer part of the unit. The analog section on the front panel is the
oscilloscope part of the unit. The oscilloscope section is labeled analog and refers to the type of
input signal. This is actually a digital oscilloscope with a cathode ray tube display. The
oscilloscope has a band width of 60 MHz and a maximum sampling speed of 200 M Sa/s ( 200
Mega samples/second or a sampling frequency of 200 MHz).
Sampling Speeds: 200 M Sa/s – 1 channel or 1 pod.
100 M Sa/s – 2 channels or 2 pods or 1 channel and 1 pod.
Measurements should be done with unused channels and pods turned off. The pods are used with
the logic analyzer part of the unit.
Deep memory oscilloscopes can capture a long time event at a high sampling rate. This
allows a user to see fast details in a long event.
Memory Depth: 2 MB for each analog channel.
4 MB for a single analog channel in single mode.
4 MB for each digital channel using 2 pods.
8 MB for each digital channel using 1 pod.
The memory is divided in half in the run mode. This allows an acquisition of a record and a
processing of the previous record. This results in a fast display update.
The introduction part of the Digitizing Oscilloscopes and the Logic Analyzers in the
Equipment Manual should be reviewed for basic theory operation. The controls for the 54621D
are similar to the HP 54601 oscilloscope and HP 54620A logic analyzer. Refer to these sections
in the Equipment Manual for an explanation of the controls. An explanation of controls in this
section is a supplement to the previous sections mentioned.