Operating Instructions
CMU-Z6
1150.0199.12
6
E-3
0
1
2
3
4
5
6
7
8
9
.
-
ON / OFF
ENTER
1100.0008. 02
VA R IA TION
D ATA
FU NC TION
SY STEM
C ONTR OL
DATA
CTRL
ME NU
SE LECT
HE LP
SETUP
m ark
sym b
E
F
B
M/ µ
µV
W
C
dBµV
k/m
G/n
A
mV
D
1
dB
dBm
UNIT.. .
EXP/ CMP
CONT/HALT
RF4 IN
UN IVERSA L R ADI O C OMMUN ICA TION TEST ER CM U 200
.
ESCAPE
*
abc
def
ghi
jkl
m no
pqr
stu
vwx
yz
_ µ
AF IN
AF OUT
VOL
DE L
AUTO
INFO
RESET
*
#
Ω
ΩΩ
Ω
AUX 1
AUX 2
SPEECH
AUX 3
DATA 2
13 d Bm MAX
2 W MAX
50 W MAX
13 d Bm MAX
RF 3 OUT
RF 2
RF 1
DATA 1
INS
CLR
CMU200
SMIQ
REF IN
REF
RF 50
Ω
Ω
Ω
Ω
RF 2
To check the accuracy of the corrected modulation measurement,
Perform
a
Preset
of the SMIQ settings and a
Reset
of the CMU.
Set the SMIQ
to comply with the CMU default analyzer settings:
FREQUENCY 1922.4 MHz
LEVEL 0 dBm
DIGITAL MOD
–> STATE
–> ON
–> SELECT STANDARD...
–> WCDMA QPSK
–> SYMBOL RATE
–> 3.84 Mcps
–> Filter
–> FILTER MODE
–> LOW_EVM
Set the
input path of the
CMU
and start the modulation measurement:
Group Config.
–> Input Level
–> Max. Level
–> Mode
–>
Manual
–> Manual Level
–>
+5 dBm
–> Attenuation
–>
Low Noise
Connect. Control
–> Synch.
–> Reference Frequency
–> Ext. (at REF IN) 10 MHz
WCDMA 1900 FDD –> Modulation
–> Application
–> Overview QPSK
The RMS Error Vector Magnitude is shown in the second row of the
Overview QPSK
output table. The
result should be approx. 1.2 %:
Please bear in mind that the displayed EVM result also contains a possible inaccuracy of the generator
signal.