Leveled Sine Wave Flatness Calibration - Fluke 5520A Service Manual

1. Connect the BNC cable to the Calibrator Mainframe's SCOPE connector. Connect
the other end of the BNC cable to the 50
5790A INPUT 2 using the BNC(f) to Double Banana adapter.
2. Set the 5790A to AUTORANGE, digital filter mode to FAST, restart fine, and Hi
Res on.
3. Press the GO ON blue softkey.
4. Press
5. Allow the 5790A rms reading to stabilize. Multiply the 5790A reading by (0.5 * (50
+ Rload) / Rload), where Rload = the actual feedthrough termination resistance, to
correct for the resistance error. Enter the corrected rms reading via the Calibrator
Mainframe front panel keypad, then press
The Calibrator Mainframe will warn when the entered value is out of
bounds. If this warning occurs recheck the setup and calculation and
carefully re-enter the corrected rms reading insuring proper multiplier
(i.e., m, u, n, p). If the warning still occurs, repair may be necessary.
6. Repeat step 5 until the Calibrator Mainframe display indicates that the next steps
calibrate Leveled Sine flatness. Press the OPTIONS, then STORE CONSTS blue
softkeys to store the new calibration constants.
5790A AC MEASUREMENT
STANDARD
INPUT 1 INPUT 2
1000V RMS MAX 1000V RMS MAX
INPUT1 INPUT1 INPUT1 SHUNT
SHELL FLOATING
HI 2.2 mV 22 mV 220 mV 2.2 V
SHUNT
3V RMS MAX 6 7 8 9
7 mV 70 mV 700 mV 7V
LO
WIDEBAND
0 1 2 3
7V RMS MAX
10V PEAK
SHELL FLOATING
MAX
2.2 mV
GROUND GUARD
10V PK
MAX
Figure 6-20. Connecting the Calibrator Mainframe to the 5790A AC Measurement Standard

6-108. 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 300 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.
to activate operating mode on the Calibrator Mainframe.
INPUT1
VIEW UTIL
. 22 V 220 mV SPEC
MENUS
REF
+/- DELETE
70V 700V
4
5 CLEAR
1kV
AUTO MAN
ENTER
POWER
I
O
Calibration and Verification of Square Wave Functions
feedthrough termination then to the
.
Note
5520A CALIBRATOR
NORMAL AUX SCOPE
V, , ,RTD A, -SENSE, AUX V
OUT PREV
STBY
OPR EARTH SCOPE BOOST MENU
HI
1000V
20V
1V PK
RMS RMS
MAX dBm sec
MAX MAX
7 8 9 m V Hz
LO 150V
PK
MAX
TRIG
20V
n W
RMS ¡F
4 5 6
MAX k A ¡C
p
20V 1 2 3
M F
20A SHELLS PK
GUARD
NOT MAX
GROUNDED
/ + 0 • ENTER
SHIFT
20V PK MAX TC 20V PK MAX
SC300 Option
EDIT
SETUP RESET
FIELD
NEW
CE
REF
MEAS TRIG
TC OUT
POWER
MULT DIV
I
x
O
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