Leveled Sine Wave Flatness Calibration; Low Frequency Calibration - Fluke 5520A Service Manual

5520A
Service Manual
AC MEASUREMENT
5790A
STANDARD
INPUT 1
1000V RMS MAX
SHELL FLOATING
SHUNT
3V RMS MAX
WIDEBAND
7V RMS MAX
SHELL FLOATING
GROUND
10V PK
MAX
Figure 6-4. Connecting the Calibrator Mainframe to the 5790A AC Measurement Standard

6-38. Leveled Sine Wave Flatness Calibration

Leveled Sine Wave flatness calibration is divided into two frequency bands: 50 kHz to 10
MHz (low frequency) and > 10 MHz to 600 MHz (high frequency). The equipment
setups are different for each band. Flatness calibration of the low frequency band is made
relative to 50 kHz. Flatness calibration of the high frequency band is made relative to 10
MHz.
Leveled Sine Wave flatness is calibrated at multiple amplitudes. Both low and high
frequency bands are calibrated at each amplitude. Calibration begins with the low
frequency band, then the high frequency band for the first amplitude, followed by the low
frequency band, then the high frequency band for the second amplitude, and so on, until
the flatness calibration is complete.
Press the OPTIONS and NEXT SECTION blue softkeys until the display reads "Set up
to measure leveled sine flatness".

6-39. Low Frequency Calibration

Connect the Calibrator Mainframe SCOPE connector to the 5790A WIDEBAND input as
described under "Equipment Setup for Low Frequency Flatness".
Follow these steps to calibrate low frequency Leveled Sine Wave flatness for the
amplitude being calibrated.
1. Press the GO ON blue softkey.
2. Establish the 50 kHz reference:
3. Press the GO ON blue softkey.
4. Adjust the amplitude using the Calibrator Mainframe front panel knob until the
5. Repeat steps 1 to 4 until the Calibrator Mainframe display indicates that the reference
6-24
INPUT 2
1000V RMS MAX
INPUT1 INPUT1 INPUT1 SHUNT INPUT1
VIEW
HI 2.2 mV 22 mV 220 mV 2.2 V . 22 V 220 mV
REF
6 7 8 9 +/- DELETE
7 mV 70 mV 700 mV 7V 70V 700V
LO
0 1 2 3 4 5
CLEAR
10V PEAK
MAX
2.2 mV 1kV
AUTO MAN
ENTER
GUARD
Allow the 5790A rms reading to stabilize.
Press the 5790A Set Ref blue softkey. (Clear any previous reference by pressing
the 5790A Clear Ref blue softkey prior to setting the new reference if required.)
5790A reference deviation matches the 50 kHz reference within 1000 ppm.
frequency is now 10 MHz. Continue with the high frequency calibration.
5520A CALIBRATOR
NORMAL AUX SCOPE
V, , ,RTD A, -SENSE, AUX V
OUT
HI
1000V 20V
RMS 1V PK
UTIL RMS
SPEC MAX
MENUS MAX MAX
LO
TRIG
20V
RMS
MAX
20A SHELLS
GUARD
NOT
GROUNDED
POWER
I
O 20V PK MAX TC 20V PK MAX
PREV
STBY
OPR EARTH SCOPE BOOST MENU
dBm sec EDIT
7 8 9 m V Hz SETUP RESET
150V FIELD
PK
MAX
n W
¡F NEW
4 5 6 k A ¡C CE
REF
p
MEAS TRIG
20V 1 2 3
M F
PK TC OUT
MAX
MULT DIV
/ + 0 • SHIFT ENTER
x
POWER
I
O
yg034f.eps