B+K precision 2652A User manual

v 092711
Model 2650A/2651 Series
3.3 GHz/8.5 GHz Spectrum Analyzer
USER MANUAL

i
Before Using the Product
· Please note the following described on the back panel.
· For safe use:
1) When abnormal sound, abnormal smell or smoke is found, stop using the
product and remove the battery and AC adapter.
2) Never handle this product with wet hands to prevent risks of electric shock, fire,
or damage.
3) Never use this product under lightning conditions to prevent risks of damage.
4) Never use any AC adapter other than specified, or it will cause damage.
Connect the power cable only to three-terminal outlet for protection from static
electricity, otherwise this product or a device under test may be damaged.
5) Never use any battery other than specified, or it may damage this product. Turn
off the power and disconnect the AC adapter before removing the battery out of
the battery compartment.
6) Be sure to charge the battery as specified in the instructions in this manual.
Moreover, an explosion, fire or smoke may occur if battery is handled
improperly.
Please read the notes for handling the battery.

ii
· Set clock function
The time information is set at Japan standard time. Set the year, month, day and
time when the 2650A series is used for the first time. (Refer to “24.4 Setting
the clock” for the details.)
· Quality assurance
Warranty
If the defect by our responsibility occurs within one year after delivered, it
shall be repaired free of charge. However, this warranty does not cover such
defect that :
1) is caused by a fire or natural disasters.
2) is caused by inappropriate handling such as dropping while moving the
unit delivered.
3) is caused by handling in contradiction to usage or precautions described
in the operating manual.
4) is caused by modification or misuse.
We will not be responsible for direct or indirect damage caused by use or
defect of this product.
Refer to the end of this manual for details.
Warm-up time
Warm up the product for at least ten minutes after turning on the power in
order to stabilize the internal circuit.
Precautions for storage
1) Avoid direct sunlight or dust.
2) Store this unit in a place where temperature is between -20 °C to 60 °C,
humidity less than 60 °C/70 %RH and variations in temperature and
humidity are small.
After service
Please contact us without hesitation if you have any questions about this
product:
B&K PRECISION
22820 Savi Ranch Parkway
Yorba Linda CA, 92887
TEL. (714) 921 - 9095 FAX. (714) 921 - 6422
URL: http://www.bkprecision.com

iii
Contents
1. OUTLINE--------------------------------------------------------------------------------------1
1.1 PRODUCT OUTLINES--------------------------------------------------------------------------1
1.2 STANDARD ACCESSORIES-------------------------------------------------------------------2
1.3 OPTIONAL ACCESSORIES--------------------------------------------------------------------2
1.4 OVERVIEW OF ALL FOUR MODELS----------------------------------------------------------3
2. SPECIFICATIONS--------------------------------------------------------------------------4
2.1 PERFORMANCE--------------------------------------------------------------------------------4
2.2 EXTERNAL VIEW-------------------------------------------------------------------------------7
3. EXPLANATION OF PANEL-------------------------------------------------------------8
4. EXPLANATION OF SCREEN---------------------------------------------------------11
5. FUNCTION MENU------------------------------------------------------------------------12
5.1 LIST OF FUNCTION MENU------------------------------------------------------------------ 12
5.2 MENU TREE---------------------------------------------------------------------------------- 13
6. PREPARING FOR OPERATION-----------------------------------------------------19
6.1 STAND ---------------------------------------------------------------------------------------- 19
6.2 CONNECTION TO POWER SUPPLY -------------------------------------------------------- 19
6.3 BATTERY CHARGE-------------------------------------------------------------------------- 20
6.4 INSTALLATION OF BATTERY --------------------------------------------------------------- 20
7. CENTER FREQUENCY <FREQ>----------------------------------------------------21
7.1 SETTING WITH STEP KEYS ([F1], [F2] ) ------------------------------------------------- 21
7.2 SETTING WITH ENCODER ------------------------------------------------------------------ 21
7.3 SETTING WITH NUMERIC KEY-------------------------------------------------------------- 22
7.4 ACCORDING TO MARKER POSITION ----------------------------------------------------- 23
8. FREQUENCY SPAN <SPAN>--------------------------------------------------------23
8.1 SWITCHING FREQUENCY BAND----------------------------------------------------------- 24
9. REFERENCE LEVEL <REFER>-----------------------------------------------------25
9.1 SETTING OF REFERENCE LEVEL --------------------------------------------------------- 25
9.2 CHANGE OF UNIT OF AMPLITUDE AXIS-------------------------------------------------- 25
9.3 SETTING OF STEP SIZE OF REFERENCE LEVEL---------------------------------------- 25
9.4 ON-OFF SETTING OF OFFSET ------------------------------------------------------------ 25
9.5 SETTING OF OFFSET LEVEL--------------------------------------------------------------- 25
9.6 SETTING OF INPUT IMPEDANCE----------------------------------------------------------- 26
9.7 REFERENCE LEVEL SETTING RANGE FOR EACH UNIT ------------------------------- 26
9.8 RELATIONSHIP BETWEEN REFERENCE LEVEL AND ATT/AMP (AT DBM)---------- 27
10. DISPLAY SCALE <SCALE>-------------------------------------------------------29
10.1 SETTING THE FUNCTION KEY ------------------------------------------------------------- 29
11. RESOLUTION BANDWIDTH <RBW>-------------------------------------------29
11.1 MANUAL MODE ---------------------------------------------------------------------------- 29
11.2 AUTO MODE -------------------------------------------------------------------------------- 30
11.3 ALL AUTO MODE -------------------------------------------------------------------------- 30

iv
12. VIDEO BANDWIDTH <VBW>------------------------------------------------------30
12.1 MANUAL MODE ---------------------------------------------------------------------------- 30
12.2 AUTO MODE -------------------------------------------------------------------------------- 30
12.3 ALL AUTO MODE -------------------------------------------------------------------------- 31
13. SWEEP AXIS / DETECTION MODE <SWEEP>------------------------------31
13.1 MANUAL MODE ---------------------------------------------------------------------------- 31
13.2 AUTO MODE -------------------------------------------------------------------------------- 31
13.3 ALL AUTO MODE -------------------------------------------------------------------------- 31
13.4 SETTING OF DETECTION MODE ---------------------------------------------------------- 31
13.5 SETTING OF TRIGGER SOURCE ---------------------------------------------------------- 32
14. AUTO TUNING <AUTO TUNE>---------------------------------------------------32
15. HOLD / RUN <HOLD/RUN>--------------------------------------------------------32
16. CALCULATION FUNCTION <CALC>-------------------------------------------33
16.1 NORMAL MODE---------------------------------------------------------------------------- 33
16.2 MAX HOLD MODE ------------------------------------------------------------------------- 33
16.3 MIN HOLD MODE -------------------------------------------------------------------------- 33
16.4 AVERAGE MODE -------------------------------------------------------------------------- 34
16.5 OVERWRITE MODE ---------------------------------------------------------------------- 34
16.6 SPURIOUS FREE MODE (2658A ONLY)---------------------------------------------- 34
17. MARKER & PEAK SEARCH <MKR> -------------------------------------------35
17.1 MOVEMENT AND BASIC FUNCTION OF MARKER --------------------------------------- 36
17.2 NORMAL PEAK SEARCH ------------------------------------------------------------------- 36
17.3 ZONE PEAK SEARCH ----------------------------------------------------------------------- 36
17.4 CHANGE UNIT OF MARKER LEVEL ------------------------------------------------------- 37
18. SAVE / LOAD <SAVE/LOAD> ----------------------------------------------------37
18.1SELECTION OF STORAGE DEVICE-------------------------------------------------------- 38
18.2 SAVE FUNCTION ---------------------------------------------------------------------------- 39
18.3 ABOUT FILE NAME -------------------------------------------------------------------------- 39
18.4 LOAD FUNCTION ---------------------------------------------------------------------------- 40
18.5 DELETE FUNCTION ------------------------------------------------------------------------- 41
18.6 PRESETTING (INITIALIZATION) ------------------------------------------------------------ 41
19. MEASURING FUNCTION <MEAS>----------------------------------------------42
19.1 CHANNEL POWER MEASUREMNT <CH POWER>------------------------------------ 42
19.2 ADJACENT CHANNEL LEAKAGE POWER MEASUREMENT <ACP> ------------------ 43
19.3 OCCUPIED BANDWIDTH MEASUREMENT <OBW>------------------------------------- 45
19.4 ELECTRIC FIELD STRENGTH MEASUREMENT <E/FANT>--------------------------- 45
19.5 MAGNETIC FIELD STRENGTH MEASUREMENT <M/F PROBE> --------------------- 49
19.6 FREQUENCY COUNTER <FREQ COUNT>--------------------------------------------- 51
20. EMI TEST (2651) ----------------------------------------------------------------------51
20.1 ADDITIONAL FUNCTION FOR EMI TEST ------------------------------------------------- 51
20.2 EMI TEST ------------------------------------------------------------------------------------ 52
21. SCREEN CONTROL <DSPL>-----------------------------------------------------54
21.1 SETTING SCREEN DISPLAY COLOR------------------------------------------------------ 55
21.2 ON/OFF SWITCHING OF LCD BACKLIGHT --------------------------------------------- 55
21.3 ADJUSTING BRIGHTNESS OF LCD BACKLIGHT----------------------------------------- 55

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22. TRACKING GENERATOR MODE (2652A)------------------------------------55
22.1 SPECIFICATION OF T.G. FUNCTION------------------------------------------------------ 55
22.2 DESCRIPTION OF I/O CONNECTOR------------------------------------------------------- 56
22.3 ON/OFF SWITCHING OF T.G. FUNCTION----------------------------------------------- 56
22.4 NORMALIZING FUNCTION ------------------------------------------------------------------ 57
23. STORAGE/PRINT SCREEN IMAGE <COPY>--------------------------------58
23.1 SELECTION OF IMAGE AREA -------------------------------------------------------------- 58
23.2 PRINT ON PRINTER ------------------------------------------------------------------------- 58
23.3 STORAGE INTO USB MEMORY ----------------------------------------------------------- 58
23.4 TRANSFERRING INTERNAL DATA TO USB MEMORY IN LUMP SUM ----------------- 59
23.5 USB PRINTER (OPTION)------------------------------------------------------------------- 59
23.6 USB MEMORY------------------------------------------------------------------------------- 60
24. UTILITY FUNCTION <UTIL>-------------------------------------------------------61
24.1 LABEL FUNCTION --------------------------------------------------------------------------- 61
24.2 MENU OFF ----------------------------------------------------------------------------------- 62
24.3 BUZZER SETTING --------------------------------------------------------------------------- 62
24.4 SETTING THE CLOCK ----------------------------------------------------------------------- 62
25. USB DEVICE FUNCTION-----------------------------------------------------------64
25.1 OUTLINE-------------------------------------------------------------------------------------- 64
25.2 HOW TO CONNECT ------------------------------------------------------------------------- 64
25.3 INSTALLATION OF DRIVER ----------------------------------------------------------------- 64
25.4 SAMPLE PROGRAM ------------------------------------------------------------------------- 64
25.5 EXPLANATION OF COMMAND-------------------------------------------------------------- 65
25.6 INPUT OF FREQUENCY --------------------------------------------------------------------- 74
25.7 TRANSFER OF SPECTRUM DATA --------------------------------------------------------- 74
25.8 WRITING OF ORIGINAL COMPENSATION DATA----------------------------------------- 75
26. OPTION ----------------------------------------------------------------------------------77
27. BASIC PERFORMANCE TEST (2650A/2651/2652A/2658A) ------------78
27.1 FREQUENCY CHARACTERISTICS --------------------------------------------------------- 78
27.2 ACCURACY OF REFERENCE LEVEL ------------------------------------------------------ 79
27.3 DISPLAY ACCURACY OF CENTER FREQUENCY ---------------------------------------- 79
27.4 DISPLAY ACCURACY OF FREQUENCY SPAN-------------------------------------------- 80
27.5 LINEARITY OF AMPLITUDE AXIS ---------------------------------------------------------- 80

1
1. Outline
1.1 Product outlines
The 2650A series are authentic spectrum analyzers in a compact and lightweight form factor providing
performance and functions comparable to large-size bench type instruments.
The features are as follows.
1) Compact and lightweight 1.8 kg.
The dimensions are 162(W)×71(H)×265(D) mm, and the weight is only 1.8 kg including the battery, making the
instrument very convenient for field use.
2) Large color TFT display
5.7 inches, 640×480 color LCD
3) Four hours battery operation
The included Lithium-ion battery, when fully charged,can provide power for up to four hours of operation with the
backlight turned off. And about 3 ½ hours with the backlight set to the minimum level.
4) USB host adapter
USB host port can be used with removable storage USB flash drives. The screen image is stored as BMP format, and
the spectrum and the setting parameters are stored as CSV format. The port conformsto USB1.1 standards and is
backwards compatible with USB 2.0 devices.
5) USB device for PC connectivity
USB interfacewith transferrates up to 12 Mbps maximum (conform to USB 1.1 standards).
6) Accurate frequency measurement by PLL synthesizer
The center frequency is accurately set by PLL (Phase Locked Loop) synthesizer. Moreover, the frequency counter
(factory option) enables more accurate measurements of the frequency of a signal.
7) Average noise level -127 dBm
The low average noise level of -127 dBm @ 1 GHz provides a wide dynamic range.
8) 100 dB display dynamic range
Wide dynamic range display with a display scale of 100 dB/10div (at 10 dB/div) in the amplitude axis.
9) Easy operation with AUTO mode
●Auto range operation: RBW, VBW and sweep time are automatically selected based on the frequency span.
●Auto tuning operation: The center frequency is adjusted to the maximum level within full span, andthe optimum
RBW, VBW and sweep time are chosen.

2
10) Abundant functions
●Measuring functions : Channel power, Adjacent channel power, Occupied bandwidth, Electric field
strength, Magnetic field strength and Frequency measurement.
●Calculation functions : Max hold, Min hold, Averaging, Over write
●Marker measurement and peak search function
●Save/Load function
●Hard copy with printer
11) PC Software
The included PC software controls all four models of the 2650A/2651 series via PC. The software emulates the front panel keys
and supports transfer of 1001 point trace data from the analyzer to the PC. Screen images can be stored in BMP format and the
spectrum data in CSV format (stores frequency and level).
12) Options
There are many options available, such as dipole antennas, magnetic field probesand USB printer
1.2 Standard accessories
1. AC adaptor MA400
2. Carrying case LC2650A
3. Accessory pouch
4. User manual
5. PC software and USB cable
6. Lithium Ion batteryMB400
1.3 Optional accessories
1. Dipole antennas M401, M402, M403, M404, M405, M406
2. Magnetic field probe PR 26M with a dedicated double shielded coaxial cable
3. Printer PT2650Awith AC adaptor,4pcs of AA batteries, one roll paper
4. Roll paper PX2650A for PT2650A printer (with 10 rolls)

3
1.4 Overview of all four models
Model
Contents
2650A
50kHz to 3.3 GHz
Applications: Cellular phone, 2.4 GHz wireless LAN, 2.5 GHz WiMAX, RF-ID,
Broadcasting
2658A
50kHz to 8.5 GHz
Covering most of the wireless communication frequency spectrum
Applications: 5GHz wireless LAN, 3.5/5.8 GHz WiMAX, Maintenance of wireless base
station
2652A
50kHz to 3.3 GHz
With 5 MHz to 3.3 GHz tracking generator
Applications: Frequency characteristics measurement of electronic component/circuit and
return loss measurement
2651
50kHz to 3.3 GHz
ForEMItest
Applications: Radiated and conducted emission measurement

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2. Specifications
2.1 Performance
Frequency section
2650A, 2652A, 2651 2658A
Frequency range
50 kHz to 3.3 GHz
50 kHz to 8.5 GHz
―――
Frequency
range
Frequency
band
Harmonic
order
50 k to 3.5
GHz
Base band
1
3.3 G to 6.3
GHz
Band 1-
1
6.1 G to 8.5
GHz
Band 1+
1
Center frequency
Setting
resolution
20 kHz
Allows rotary encoder, numeric key and function key
Accuracy
within ±(30+20T) kHz±1 dot
@frequency span: 200 kHz to 10MHz,
RBW 3 kHz, 23±5°C
within±(60+300T) kHz±1dot
@frequency span: 20 MHz to 3.3 GHz,
RBW 100 kHz、23±5°C
T: sweep time (s)
within±(30+20T) kHz ±1dot
@frequency span: 200 kHz to 10MHz,
RBW 3 kHz, 23±5°C
within ±(60＋300T) kHz±1dot
@frequency span: 20 MHz to 8.5 GHz,
RBW 100 kHz, 23±5°C
T: sweep time (s)
RBW
frequency
error
within ±4 kHz @ 3 kHz, 10 kHz, 30 kHz
within 20% of RBW @ RBW: 100 kHz, 300 kHz
within 10% of RBW @ RBW: 1 MHz, 3 MHz
Frequency span
Setting range
0Hz (zero span),
200 kHz to 2 GHz (1-2-5 step) and
3.3 GHz (full span)
0Hz (zero span),
200 kHz to 5 GHz (1-2-5 step) and
8.5 GHz (full span)
Accuracy
within ±3% ±1dot
@ sweep time of 0.3s, 23±5 °C
Display resolution
# of points per trace
501dotson LCD screen, 1001dotsreadout via PC
(501 dots are visible on the display, 1001 dots oftrace data are captured internally and can be
transferred to a PC via USB device interface.)
Resolutionbandwidth
3dB bandwidth(6 dB for 2651 @ 9 kHz, 120 kHz)
Setting range
3kHz to 3 MHz (1-3 step)and AUTO
(2651: 3 kHz, 9 kHz, 30 kHz, 120 kHz, 300 kHz, 1 MHz, 3 MHz)
Accuracy
±20%
Selectivity
1:12 (typical, 3 dB : 60 dB)
Video bandwidth
100 Hz to 1 MHz (1-3 step) and AUTO
SSB phase noise
-90 dBc/Hz (typical)
@100 kHz offset, RBW : 3kHz, VBW : 100 Hz, sweep time: 1 s
Spurious response
less than -60 dBc
Harmonics
less than -40 dBc @
≧
100 MHz
Ｔ：掃引時間

5
Amplitudesection
2650A, 2652A, 2651
2658A
Reference level
Setting range
+10 to -60 dBm(1dB step)
Accuracy
within±0.8 dB ± 1dot
@center frequency : 100 MHz, RBW : 3MHz, VBW : 1MHz, REF : -15 dBm, 23±5 °C
Unit
dBm,
dBV, dBmV, dBμV, dBμV/m, dBμA/m
(dBμV/m and dBμA/m are used for measurement functions)
Average noise level
-127 dBm (typical) @ CF : 1GHz, RBW : 3kHz, VBW : 100 Hz, Ref. level < -40dBm ( preamp
automatically ON)
Frequency
characteristics
within±2.0 dB ±1dot @50 kHz to 100 MHz
within±1.0 dB ±1dot @ 100 MHz to 3.3 GHz
within±2.0 dB ±1dot @50 kHz to 100 MHz
within±1.0 dB ±1dot @100 MHz to 8.5 GHz
Input impedance
50 Ω
Input VSWR
less than 2.0
Input attenuator
Operating
range
0 to 25 dB (1 dB step), coupled with reference level
Switching
error
±0.6 dB @100 MHz
RBW switching error
±0.6 dB
Display resolution
(vertical)
381 dots/10div
Display
scale
Scale
10 dB/div, 5 dB/div, 2 dB/div
Accuracy
±(0.2 dB+1dot)/2 dB ±(0.4 dB+1dot)/5 dB
±(0.8 dB+1dot)/10 dB ±(1.8 dB+1dot)/83 dB
Input damage level
+27 dBm (CW average power), 25VDC
Sweep section
2650A, 2652A, 2651
2658A
Sweep time
Setting range
10 ms to 30 s and AUTO
@frequency span : 0 to 2 GHz
30 ms to 30 s and AUTO
@frequency span : full span
1-3 step
10 ms to 30 s and AUTO
@frequency span : 0 to 2 GHz
30 ms to 30 s and AUTO
@frequency span : 5 GHz, full span
1-3 step
Accuracy
Within ±0.1 %±1dot
@frequencyspan : 0 to 2GHz
Within ±0.1 %±1dot
@frequencyspan : 0 to 5GHz
within ±1.5 %±1dot @ full span
within ±2.5 %±1dot @ full span
Trigger
Trigger mode
AUTO (Available only for zero span)
Trigger source
Internal and External

6
External trigger
Input voltage range
Frequency range
Input coupling
Trigger level
Input RC
Input damage level
Input connector
1 to 10 Vp-p
DC to 5 MHz
DC coupling
approx. 0.56 V(fix)
approx. 10 kΩ / less than 15 pF
±50 V(DC+AC peak)
SMA(J)
Detection mode
Positive peak, Negative peak, Sample
(QP and AV for model 2651 only.)
Function
2650A, 2652A, 2658A, 2651 common
Marker measurement
NORM：displays frequency (8digits max) and level (4digits max) at marker point.
DELTA
：
displays frequency difference and level difference between two markers.
Peak search function
Searches for peak level with all of 10 div (NORM mode) or within ZONE specified
(ZONE mode) and displays frequency and level at peak level, and moreover NEXT peak at
NORM mode.
Calculation function
NORM, MAX HOLD, MIN HOLD, AVERAGE, OVER WRITE
Number of sweeps is 2 to 1024 (power of 2 ) and infinite.
Measuring function
Channel power, Adjacent channel power, Occupied bandwidth, Electric field strength
(needs optional dipole antenna), Magnetic field strength (needs optional magnetic field
probe) and Frequencycounter
Auto tuning
When pressing AUTO TUNE key, the spectrum of maximum level within full span is
adjusted to center, and reference level, RBW, VBW and sweep time are set to optimum
parameters.
Save/
Load
Save
Saves 200 spectrums and 200 setting parameters
Load
Loads one spectrum and one setting parameter
General
2650A, 2652A, 2658A, 2651 common
Input connector
N(J) connector
USB Communication
Protocol
USB version1.1 (willalso work with USB 2.0 devices)
Device Connector
B plug
Transfer rate
12 Mbps
Hard copy
USB printer (option) connected to A plug (host) enables hard copy of screen.
host connector
A plug
Display
Display
5.7 inchesand color LCD
Backlight
LED backlight
Number of dots
640(H) x 480(V) dots
Power supply
Dedicated
AC adaptor
Input : 100 to 240 VAC
Output : 9 VDC/2.6 A
Lithium-ion battery
Charge function
Remainder indication
MB400 : 7.4 V/5000 mAh Li-Ion battery
Capable of charging during power-off.
Indicates4 conditions with two colors LED (red and green).
5 level indicator

7
Other
2650A, 2652A, 2658A, 2651 common
Operating temperature
0 to 50°C(guaranteed at 23±10 °C, without soft carrying case)
Operating humidity
less than 40 °C/80 %RH
(guaranteed at less than 33 °C/70 %RH, without soft carrying case)
Storage temperature
-20 to 60 °C, less than 60 °C/70 %RH
Dimensions
162(W) x 71(H) x 265(D) mm , 6.38 (W) x2.80 (H) x 10.43 (D) inch
(excluding projections, protection bumper and stand)
Weight
approx. 1.8 kg or 4 lbs (including battery)
* Refer to section 22)Tracking Generator Mode for the specifications of the tracking generator, model 2652A.
2.2 External view
* B&K Precision reserves the right to make changes in design, specification and other information without prior notice.
[Unit : mm]

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3. Explanation of Panel
1) TFT display
This is a large liquid crystal display with 640 (H) x 480 (V) dots.It simultaneously displays spectrum (10div x
10 div), various setting parameters and measured values.
2) Function key (F1 to F6)
The function can change according to the operation key.
3) Center frequency key

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The center frequency is set with this key. The setting range is 0 to 3.3 GHz (for 2650A, 2652A, and 2651), and
0 to 8.5 GHz (for 2658A).The setting resolution is 20 kHz.
4) Frequency span key
The frequency span is set with this key.
For 2650A, 2652A, and 2651, it is set in the range from 200 kHz to 2GHz, ZERO SPAN or FULL SPAN (3.3
GHz). For 2658A, it is set in the range from 200 kHz to 5 GHz, ZERO SPAN or FULL SPAN (8.5 GHz).
5) Reference level key
The reference level is set with this key. It can be set in the range from +10 dBm to –60 dBm by1 dB step.
6) Resolution bandwidth key
The resolution bandwidth is set with this key. It can be set in the range from 3kHz to 3MHz and to AUTO.
7) Video bandwidth key
The video bandwidth is set with this key. It can be set in the range from 100 Hz to 1 MHz and to AUTO.
8) AUTO tuning key
When pushing this key, the spectrum with the maximum level is searched within full span (3.3 GHz @
2650A/2652A/2651 and 8.5 GHz @ 2658A), and then it is adjusted to the center of the screen, and the
optimum setting parameters are set. In the case when in zero span, full span, input signal level lower than –40
dBm and input frequency lower than 50 MHz, this function will not work correctly.
9) Measuring function key
Available for Channel power, Adjacent channel leakage power, Occupied frequency bandwidth, Electric field
strength, and Magnetic field strength measurement.
10) Calculation function key
Available for Max hold, Min hold, Average and Over write.
11) Display scale key
The display scale of amplitude axis can be selected as 2dB/div, 5 dB/div or 10 dB/div with this key.
12) Sweep key
The sweep time can be set in the range from 10 ms to 30 s or AUTO. This key can also select the detection
mode.
13) Hold/Run key
Used to hold or run measurements.

10
14) Marker & Peak search key
This key is used for setting marker or peak search.
15) Save/Load key
Used for saving or loading a spectrum or settings parameters.
16) Copy key
This key allows the screen image to be printed on USB printer (option) or stored in USB memory.
17) UTIL key
Used for setting label entry, clock, and buzzer.
18) Display control key
Used for setting color, backlight ON/OFF or brightness of backlight.
19) Rotary encoder
This is used for adjusting settings and parameters.
20) Power switch
This is for power ON or OFF.
21) Input connector
N(J) connector
22) Indicator for charging condition
Two color LED indicates the charging conditions of battery.
23) Input connector for DC power source
Connect AC adaptorMA400.
24) USB A plug
For connecting USB printer (option) or USB memory.
25) USB B plug
For interfacing with a PC

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4. Explanation of Screen
Function Menu
UNCAL
**UNCAL Display
Remaining Battery
Display Spectrum Display
10div x 10 div
Active Area Display
Center frequency, Frequency span,
Resolution bandwidth, Video bandwidth
Reference level, Input attenuator,
Display scale
Sweep time,
Detection mode
Calculation function display
Measuring function display
Operating Information display
Loaded spectrum information display
*This is also used as a display for set values
when the measuring function is used.
**UNCAL is displayed when a normal measurement cannot be done due to sweep rate being too fast. In such
cases, slowing down the sweep rate will change this indicator.
Measured Values display
Sweep Axis Setting
Values Display
Amplitude AxisSettingValuesDisplay
Frequency Axis Setting Values Display
Upper: Label Display
Lower: Clock Display

12
5. Function Menu
5.1 List of Function Menu
The function menu is shown in the table below. For descriptions of each function, see their respective page. For the
sequence of selection for the function menu, refer to “5.2 Menu tree”.
**1 2651only **2 2658A only **3 2652A only
Function menu
Key Sequence
Page
A
ACP OFFSET MEAS →(F2)→F2 42
ACP
MEAS→F2
41
ACP WIDTH
MEAS→(F2) →F3
42
ANT
MEAS→(F4)→F1
44
AVG
CALC → F4
32
B
BACK LT
DSPL →F2
53
BACKSPACE
FREQ → F6 → F5
21
BAND CNTR
MEAS →(F1) →(F1)
→F2
41
BAND WIDTH
MEAS→(F1) →(F1)
→
F3
41
BRIGHT DSPL →F3 53
BUZZER
UTIL →F3
59
C
CENTER FREQ ←
FREQ → F1
20
CENTER FREQ →
FREQ → F2
20
CH POWER MEAS →F1 41
CLEAR
FREQ → F6 → F4
21
CLOCK CONFIG
UTIL → F4
59
COLOR DSPL → F1 53
CONV
MKR→ F6
33
D
DELETE
SAVE/LOAD → F3
36
DEVICEMEM
SAVE/LOAD → F4
36
DET
SWEEP → F4
29
DISP CLEAR
SAVE/LOAD → F2 →
F5
38
E
E/F ANT
MEAS→ F4
43
EncST
FREQ → F4
20
EMI-C **1 SAVE/LOAD→ F6 →
F2 50
EMI-R **1
SAVE/LOAD → F6 →
F3
50
F
FREQ COUNT
MEAS→ F6
49
I
IMP
REFER→ F6
25
K
KeyST
FREQ → F3
20
L
LABEL
UTIL → F1
58
LOAD
SAVE/LOAD → F2
38
M
M/F PROBE
MEAS→ F5
47
MAX HLD
CALC → F2
31
MEASOFF
MEAS→(F1~5) → F6
41
MIN HLD
CALC → F3
31
MARKER DELTA MKR→ F2 33
MARKER
NORMAL
MKR→ F1
33
Function menu
Key Sequence
Page
M
MODE
MEAS→(F1 → F3)
→ F1
41to 43
N
NEXT PEAK
MKR→(F4) → F2
34
NORMAL
CALC → F1
31
NORMAL **1
SAVE/LOAD → F6 →
F1
50
O
OBW
MEAS→ F3
42
OFSdB
REFER→ F5
24
OFSSTEP
REFER→ F3
24
OVRWR CALC → F5 32
P
PEAK SEACHMKR→(F5)→ F1 34
PEAK SERCH
NORM
MKR→ F4
34
PEAK SERCH
ZONE
MKR→ F5
34
PRESET SAVE/LOAD → F6 36
PROBE
MEAS→(F5) → F1
48
R
RATIO
MEAS→(F3) → F2
43
RBW ALL AUTO
RBW → F3
28
RBW AUTO
RBW → F2
28
RBW MANUAL
RBW → F1
27
REFERENCE
CENTER MEAS→(F2) → F4 42
REFERENCE
WIDTH
MEAS→(F2) → F1→
F5
42
S
SAVE
SAVE/LOAD → F1
36
SCALE 5dB
SCALE → F3
27
SET MKR FREQ → F5 20
SPR. FR **2
CALC → F6
32
SWEEP AUTO
SWEEP → F2
29
SWEEP MANUAL
SWEEP → F1
29
T
T.G.MODE **3
SWEEP → F6
55
TRIG
SWEEP → F5
30
Ten Key MODE FREQ → F6 20
U
UNIT REFER→ F1 → 4 24
V
VBW ALL AUTO
VBW → F3
29
VBW AUTO
VBW → F2
28
VBW MANUAL
VBW → F1
28
Z
ZONE CENTER
MKR→(F5) → F1
35
ZONE WIDTH MKR →(F5) → F2 35

13
5.2 Menu Tree
The following is the sequence of selection for the function menu. The function menu corresponds to the function key
of F1 to F6.
“Function menu”
* Refer to “8. Frequency Span”for details.
NORMAL
SPAN
FULL
SPAN
ZERO
SPAN
SPAN
50MHz
1 GHz 1MHz
SPAN
: Set the frequency span
* Refer to “9. Reference Level”for details.
UNIT
dBm
RL STEP
1dB
OFSSTEP
1dB
REFER
OFFSET
OFF
OFSdB
0dB
IMP
50Ω
: Set the reference level
ANT
E/F M/F
PROBE
FREQ
COUNT
F1
CH POWER
ACP
OBW
F2 F3 F4 F5 F6
: Set the center frequency
CENTER
FREQ
KeyStep
100MHz
EncStep
10MHz
SET
MKR
Ten Key
MODE
GHz
MHz
CLEAR
“.”
BACK
SPACE
RETURN
* Refer to “7. Center Frequency”for details.
FREQ

14
* T.G. MODE is only for 2658A.
* Refer to “13. Sweep Axis / Detection Mode”for details.
SWEEPTIME
AUTO
MANUAL ALLAUTO
SWEEP
: Set the sweep time
T.G.
ON
NORM
ON
DET
SMPL
TRG
INT
T.G.
MODE
* Refer to “12. Video Bandwidth”for details.
VBW
AUTO
MANUAL ALLAUTO
VBW
:SettheVBW
* Refer to “11. Resolution Bandwidth”for details.
RBW
AUTO
MANUAL ALLAUTO
RBW
:SettheRBW
* Refer to “10. Display scale” for details.
SCALE
5dB/10dB/ 2dB/
SCALE
:Set thedisplay scale