Fluke 5520A - Page 305

5520A-SC600 Option
Calibrating the Pulse and Frequency Response on an Oscilloscope
8
8-21
8-33. Pulse Response Calibration Using a Tunnel Diode Pulser
You can use the calibrator to drive a tunnel diode pulser (Fluke Part Number 606522, or
Tektronix 067-0681-01, or equivalent), allowing you to check for pulse edge rise times
as fast as 125 ps.
The calibrator sources a maximum pulser drive signal of 100 V p-p at 100 kHz. The
recommended (and default) output setting is 80 V p-p at 100 kHz.
Perform the following procedure to use a tunnel diode pulser:
1. Connect the calibrator, tunnel diode pulser, and oscilloscope as shown in Figure 8-2.
2. With the SC600 Option in EDGE mode, press the TDPULSE softkey to “on”.
3. Press O.
4. Rotate the control on the pulser box to the minimum setting necessary to trigger a
reading.
HI
LO
TRIG
GUARD
TC
20A
NORMAL AUX
SCOPE
OUT
V, , ,
RTD
A, -SENSE,
AUX V
20V PK MAX
20V PK MAX
5520A
CALIBRATOR
nn229f.eps
Figure 8-2. Tunnel Diode Pulser Connections
8-34. The Leveled Sine Wave Function
The Leveled Sine Wave (LEVSINE) function uses a leveled sine wave, whose amplitude
remains relatively constant over a range of frequencies, to check the oscilloscope’s
bandwidth. When you check your oscilloscope, you change the wave’s frequency until
the amplitude displayed on the oscilloscope drops 30%, which is the amplitude that
corresponds to the -3 dB point. Default values are 30 mV p-p, 50 kHz.
To access the LEVSINE menu, press the softkey under MODE until “levsine” appears.