Fluke 5700A Series II - Page 78

5700A/5720A Series II
Operators Manual
3-8
Table 3-1. Front Panel Features (continued)
Q
s (Specification)
Causes the calibrator to compute and display its absolute uncertainty for the
present output setting for the calibration interval selected in the setup
menus.
R
o
Identifies a UUT zero-scale endpoint and does not change the output.
Subsequent keyed-in output values have the offset value (the calibrator’s
output value when OFFSET was pressed) added to them. Offset mode is
deactivated by pressing OFFSET again or by selecting another function.
Offsets are available for dc outputs only. See "Programming an OFFSET" in
Chapter 4 for details.
S
C (Clear Entry)
Clears a partially completed keypad entry from the Control Display or clears
an error message that requires acknowledgement. If there is a partially
completed entry when
C is pressed, the output is unaffected.
T
N
Only active during error mode operation, the
N key establishes the
present output value as a new reference for meter error computation.
U
D
When in the ac volts or wideband function, and if no entry is in progress, the
dBm key shows the equivalent dBm output on the Control Display. For the
ac voltage function, dBm is calculated for a 600Ω load. For the wideband
function, dBm is calculated for a 50Ω resistive termination at the end of a 3-
foot 50Ω coaxial cable.
The formula for computing dBm is: 10 * log(power in mW)
Examples:
For 3.0V into a 600Ω load, dBm = 10 log(15.000) = 11.7609 dBm
For 3.0V into a 50Ω load, dBm = 10 log(180.000) = 22.5527 dBm
V
E
The
E key loads an output value that was entered into the Control
Display into the calibrator. If you press E without identifying the
units for the entry, the calibrator keeps the most recently used units. The
multipliers are not saved. For example, if the most recently entered value
was 1 mV, then simply entering 10 produces an output of 10V. (The "V" units
were saved from the last entry, but not the multiplier, "m".)
Another function of the
E key is to recall the currently-programmed
reference value during error mode operation. Refer to "Error Mode
Operation" in Chapter 4 for details.
W
Output Function Keys
Select the output function. The output functions are:
D Decibels relative to 1 mW
V Voltage
A Current
Q Resistance
H Frequency
When Hz is entered, the calibrator automatically switches to ac. When a new
signed (+ or -) output value is entered without specifying Hz, the calibrator
automatically switches back to dc.