Fluke 5520A - 6-38. Leveled Sine Wave Flatness Calibration

5520A
Service Manual
6-24
POWER
I
O
5790A
AC MEASUREMENT
STANDARD
1000V RMS MAX 1000V RMS MAX
3V RMS MAX
INPUT 1 INPUT 2
SHUNT
HI
LO
GUARDGROUND
SHELL FLOATING
10V PEAK
MAX
WIDEBAND
7V RMS MAX
MAX
10V PK
SHELL FLOATING
INPUT1
SHUNT
INPUT1 INPUT1 INPUT1
2.2 mV 22 mV 220 mV
7 mV 70 mV 700 mV
2.2 V 22 V 220 mV
7V 70V 700V
1kV 2.2 mV
AUTO
MAN
VIEW
REF
UTIL
MENUS
SPEC
CLEAR
DELETE
ENTER
01 2 3
4
5
6
7
89
+/-
.
POWER
I
O
0•
123
456
789
ENTER
M
k
m
VHz
FIELD
EDIT
/
+
F
OPR EARTH SCOPE BOOST MENU
PREV
SHIFT
RESET
CE
SETUP
REF
NEW
TC
MEAS
¡F
µ
n
p
W
dBm sec
¡CA
MULT
x
DIV
÷
OUT
TRIG
5520A
CALIBRATOR
STBY
HI
LO
TRIG
GUARD
TC
20A
1000V
RMS
MAX
20V
RMS
MAX
20V
PK
MAX
1V PK
MAX
SHELLS
NOT
GROUNDED
NORMAL AUX
SCOPE
OUT
V, , ,
RTD
A, -SENSE,
AUX V
150V
PK
MAX
20V
RMS
MAX
20V PK MAX
20V PK MAX
yg034f.eps
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:
• 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.)
3. Press the GO ON blue softkey.
4. Adjust the amplitude using the Calibrator Mainframe front panel knob until the
5790A reference deviation matches the 50 kHz reference within 1000 ppm.
5. Repeat steps 1 to 4 until the Calibrator Mainframe display indicates that the reference
frequency is now 10 MHz. Continue with the high frequency calibration.