Overview; Power; Reset - Stanford Research Systems SR844 User Manual

Overview

STANFORD RESEARCH SYSTEMS STANFORD RESEARCH SYSTEMS STANFORD RESEARCH SYSTEMS STANFORD RESEARCH SYSTEMS STANFORD RESEARCH SYSTEMS STANFORD RESEARCH SYSTEMS
TIME CONSTANT TIME CONSTANT TIME CONSTANT TIME CONSTANT TIME CONSTANT TIME CONSTANT SENSITIVITY SENSITIVITY SENSITIVITY SENSITIVITY SENSITIVITY SENSITIVITY
FILTER OVLD FILTER OVLD FILTER OVLD FILTER OVLD FILTER OVLD FILTER OVLD NO FILTER NO FILTER NO FILTER NO FILTER NO FILTER NO FILTER
OVLD OVLD OVLD OVLD OVLD OVLD
ks ks ks ks ks ks 6 dB/Octave 6 dB/Octave 6 dB/Octave 6 dB/Octave 6 dB/Octave 6 dB/Octave
ERROR ERROR
x100 x100 x100 x100 x100 x100 s s s s s s 12 12 12 12 12 12 IF OVLD IF OVLD IF OVLD IF OVLD IF OVLD IF OVLD
DIAG DIAG
3 3 3 3 3 3 x10 x10 x10 x10 x10 x10 ms ms ms ms ms ms 18 18 18 18 18 18
µs µs µs µs µs µs
1 1 1 1 1 1 x1 x1 x1 x1 x1 x1 24 24 24 24 24 24 AUTO AUTO AUTO AUTO AUTO AUTO
SETTLE... SETTLE... SETTLE... SETTLE... SETTLE... SETTLE... NO FILTER NO FILTER AUTO AUTO AUTO AUTO AUTO AUTO
dBm dBm dBm dBm dBm dBm FULL SCALE FULL SCALE FULL SCALE FULL SCALE FULL SCALE FULL SCALE V [rms] V [rms] V [rms] V [rms] V [rms] V [rms]
SIGNAL INPUT SIGNAL INPUT SIGNAL INPUT SIGNAL INPUT SIGNAL INPUT SIGNAL INPUT
-67 -67 -67 -67 100µ 100µ 100µ 100µ +13 +13 +13 +13 +13 +13 1 1 1 1 1 1
-67 -67 100µ 30µ 30µ 30µ 100µ 30µ 300m 300m 300m 300m 300m 300m
-87 -87 -87 -87 10µ 30µ 10µ 10µ 30µ 10µ -7 -7 -7 -7 -7 -7 100m 100m 100m 100m 100m 100m
RF OVLD RF OVLD RF OVLD RF OVLD RF OVLD RF OVLD
-87 -87 3µ 10µ 3µ 3µ 10µ 3µ 30m 30m 30m 30m 30m 30m
WIDE RESERVE WIDE RESERVE WIDE RESERVE WIDE RESERVE WIDE RESERVE WIDE RESERVE -107 -107 -107 -107 1µ 3µ 1µ 1µ 1µ 3µ -27 -27 -27 -27 -27 -27 10m 10m 10m 10m 10m 10m
-107 -107 300n 300n 300n 1µ 1µ 300n 3m 3m 3m 3m 3m 3m
50 Ω 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω
HIGH HIGH HIGH HIGH HIGH HIGH
-127 -127 -127 -127 300n 100n 100n 100n 300n 100n -47 -47 -47 -47 -47 -47 1m 1m 1m 1m 1m 1m
-127 -127 100n 100n 300µ 300µ 300µ 300µ 300µ 300µ
NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL AUTO AUTO AUTO AUTO AUTO AUTO
1 MΩ 1 MΩ 1 MΩ 1 MΩ 1 MΩ 1 MΩ
LOW NOISE LOW NOISE LOW NOISE LOW NOISE LOW NOISE LOW NOISE
30 pF 30 pF 30 pF 30 pF 15 pF 15 pF
Sig Sig Sig Sig Sig Sig
Z – In Z – In Z – In Z – In Z – In Z – In
HIGH HIGH HIGH HIGH HIGH HIGH
AUTO AUTO AUTO AUTO AUTO AUTO
NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL
LOW NOISE LOW NOISE LOW NOISE LOW NOISE LOW NOISE LOW NOISE
SIGNAL SIGNAL SIGNAL SIGNAL SIGNAL SIGNAL
< 1 V rms < 1 V rms < 1 V rms < 1 V rms
< 1 V rms < 1 V rms
+13dBm +13dBm +13dBm +13dBm
IN IN IN IN IN IN
Close Close Close Close Close Close
5 V DC+AC 5 V DC+AC Resrv Resrv Resrv Resrv Resrv Resrv
5 V DC+AC 5 V DC+AC 5 V DC+AC 5 V DC+AC
25 kHz – 25 kHz – 25 kHz – 25 kHz – 25 kHz – 25 kHz –
MAX MAX
200 MHz 200 MHz 200 MHz 200 MHz 200 MHz 200 MHz MAX MAX MAX MAX
AUTO AUTO AUTO AUTO AUTO AUTO
Signal In

Power

The power switch is on the rear panel. The SR844 is turned on by pushing the switch up.
The serial number (5 digits) is shown on the CH1 and CH2 displays and the
REFERENCE display shows the firmware version. The following internal tests are
performed.
DATA
BATT
PROG
DSP
RCAL

Reset

The SR844 may be set to the factory preset settings at any time by pressing Shift–Recall
(Shift then Recall).
To completely reset the unit, hold down the Setup key while the power is turned on. The
unit will ignore previous setups and use the factory preset settings.
CH1 Display
Model SR844 RF Lock-In Amplifier Model SR844 RF Lock-In Amplifier Model SR844 RF Lock-In Amplifier Model SR844 RF Lock-In Amplifier Model SR844 RF Lock-In Amplifier Model SR844 RF Lock-In Amplifier
V V V V V V
Ratio Ratio Ratio Ratio Ratio Ratio
mV mV mV mV mV mV
µV µV µV µV µV µV
dBm dBm dBm dBm dBm dBm
nV nV nV nV nV nV
pV pV pV pV pV pV
XY Offs XY Offs XY Offs XY Offs Offset Offset R Offs R Offs R Offs R Offs Expand Expand Expand Expand Expand Expand REL CAL CAL REL REL Rel
CHANNEL ONE CHANNEL ONE CHANNEL ONE CHANNEL ONE CHANNEL ONE CHANNEL ONE
X X X X X X OVERFLOW OVERFLOW OVERFLOW OVERFLOW OVERFLOW OVERFLOW
R [V] R [V] R [V] R [V] R [V] R [V] UNDERFLOW UNDERFLOW UNDERFLOW UNDERFLOW UNDERFLOW UNDERFLOW CAL CAL OVLD OVLD OVLD OVLD OVLD OVLD
R [dBm] R [dBm] R [dBm] R [dBm] R [dBm] R [dBm]
X noise X noise X noise X noise X noise X noise AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 x10 x10 x10 x10 x10 x10 DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY
AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 x100 x100 x100 x100 x100 x100 X X X X X X
Display Display Display Display Display Display Ratio Ratio Ratio Ratio Ratio Ratio Expand Expand Expand Expand Expand Expand Output Output Output Output Output Output
CH1 OUTPUT CH1 OUTPUT CH1 OUTPUT CH1 OUTPUT CH1 OUTPUT CH1 OUTPUT
OFFSET OFFSET OFFSET OFFSET OFFSET OFFSET
On/Off On/Off On/Off On/Off On/Off On/Off Auto Auto Auto Auto Auto Auto Modify Modify Modify Modify Modify Modify
<20mA <20mA <20mA <20mA <20mA <20mA
CH1 Out
Performs a read/write test to the processor RAM.
The nonvolatile backup memory is tested. Instrument settings are stored in
nonvolatile memory and are retained when the power is turned off.
Checks the processor ROM.
Checks the digital signal processor (DSP).
If the backup memory check passes, then the instrument returns to the settings
in effect when the power was last turned off (RCAL USER is displayed). If
there is a memory error, then the stored settings are lost and the factory preset
values are used (RCAL STD)
CH2 Display
V V V V V V
OVLD OVLD OVLD OVLD OVLD OVLD Ratio Ratio Ratio Ratio Ratio Ratio
mV mV mV mV mV mV
TRIG TRIG TRIG TRIG TRIG TRIG
µV µV µV µV µV µV
dBm dBm dBm dBm dBm dBm
FREQ FREQ FREQ FREQ FREQ FREQ
nV nV nV nV nV nV
DEG DEG DEG DEG DEG DEG pV pV pV pV pV pV
XY Offs XY Offs XY Offs XY Offs Offset Offset Offset Offset Offset Offset Expand Expand Expand Expand Expand Expand CAL CAL
REL REL REL REL
CHANNEL TWO CHANNEL TWO CHANNEL TWO CHANNEL TWO CHANNEL TWO CHANNEL TWO
Y Y Y Y Y Y
θ θ θ θ θ θ
CAL CAL OVLD OVLD OVLD OVLD OVLD OVLD
CH2 RATIO CH2 RATIO CH2 RATIO CH2 RATIO
Y noise [V] Y noise [V] Y noise [V] Y noise [V] Y noise [V] Y noise [V]
Y noise [dBm] Y noise [dBm] Y noise [dBm] Y noise [dBm] Y noise [dBm] Y noise [dBm] AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 AUX IN 1 x10 x10 x10 x10 x10 x10 DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY
AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 AUX IN 2 x100 x100 x100 x100 x100 x100 Y Y Y Y Y Y
Display Display Display Display Display Display Ratio Ratio Expand Expand Expand Expand Expand Expand Output Output Output Output Output Output
CH2 OUTPUT CH2 OUTPUT CH2 OUTPUT CH2 OUTPUT CH2 OUTPUT CH2 OUTPUT
OFFSET OFFSET OFFSET OFFSET OFFSET OFFSET
On/Off On/Off On/Off On/Off On/Off On/Off Auto Auto Auto Auto Auto Auto Modify Modify Modify Modify Modify Modify
<20mA <20mA <20mA <20mA <20mA <20mA
CH2 Out

Overview

Reference Display
SETUP SETUP SETUP SETUP SETUP SETUP
Save Save Save Save Save Save Recall Recall Recall Recall Recall Recall
PRESET PRESET PRESET PRESET PRESET PRESET
SCAN MODE SCAN MODE SCAN MODE SCAN MODE SCAN MODE SCAN MODE XY READY XY READY XY READY XY READY XY READY XY READY
START START START START START START STOP STOP STOP STOP STOP STOP Offst% Offs % Offs % Offst% Offs % Offs %
SCAN DONE SCAN DONE SCAN DONE SCAN DONE SCAN DONE SCAN DONE R[dBm]θ R[dBm]θ R[dBm]θ R[dBm]θ R[dBm]θ R[dBm]θ
ERROR ERROR REL MODE CAL/LOCK REL MODE CAL/LOCK REL MODE REL MODE
PHASE PHASE PHASE PHASE PHASE PHASE FREQ FREQ FREQ FREQ FREQ FREQ AxOut1 AxOut1 AxOut1 AxOut1 AxOut1 AxOut1
SCAN – REL SCAN – CAL SCAN – REL SCAN – REL SCAN – CAL SCAN – REL
Scan Scan Scan Scan Scan Scan Cal Rel Rel Rel Rel Cal
Phase Phase Phase Phase Phase Phase +90˚ +90˚ +90˚ +90˚ +90˚ +90˚ Zero Zero Zero Zero Zero Zero
Set Set Set Set Set Set Mode Mode Mode Mode Mode Mode
OFF OFF OFF OFF OFF OFF CLEAR ALL CLEAR ALL CLEAR ALL CLEAR ALL CLEAR ALL CLEAR ALL AUTO AUTO AUTO AUTO AUTO AUTO 90˚ 90˚ 90˚ 90˚ 90˚ 90˚
– – – – – –
UNLOCK UNLOCK UNLOCK UNLOCK UNLOCK UNLOCK
Start/ Start/ Start/ Start/ Start/ Start/ Store Store Store Store Store Store OUT OF RANGE OUT OF RANGE OUT OF RANGE OUT OF RANGE OUT OF RANGE OUT OF RANGE
Freq Freq Freq Freq Freq Freq AuxOut AuxOut AuxOut AuxOut AuxOut AuxOut
Step Step Step Step Step Step X Y X Y X Y X Y X Y X Y
I. F. I. F. I. F. I. F.
STORE R[dBm] θ STORE R[dBm] θ STORE R[dBm] θ STORE R[dBm] θ STORE R[dBm] θ STORE R[dBm] θ
CLEAR ONE CLEAR ONE CLEAR ONE CLEAR ONE CAL STEP CAL STEP PRECISE FREQ PRECISE FREQ PRECISE FREQ PRECISE FREQ I. F. I. F. PRECISE FREQ PRECISE FREQ
2 F 2 F 2 F
Hi – Z 10 kΩ 40 pF 10 kΩ 40 pF Hi – Z 10 kΩ 40 pF 10 kΩ 40 pF EXTERNAL INTERNAL EXTERNAL INTERNAL EXTERNAL EXTERNAL
INTERFACE INTERFACE INTERFACE INTERFACE INTERFACE INTERFACE
50 Ω 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω
EXTERNAL INTERNAL EXTERNAL INTERNAL INTERNAL INTERNAL
ERROR ERROR ERROR ERROR ERROR ERROR GPIB/RS232 GPIB/RS232 GPIB/RS232 GPIB/RS232 GPIB/RS232 GPIB/RS232
Ref Ref Ref Ref Ref Ref
Source Source Source Source Source Source
ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS Z – In Z – In Z – In Z – In Z – In Z – In
ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE BAUD BAUD BAUD BAUD BAUD BAUD
2 F
SRQ SRQ SRQ SRQ SRQ SRQ PARITY PARITY PARITY PARITY PARITY PARITY
REF IN REF IN REF IN REF IN REF IN REF IN REF OUT REF OUT REF OUT REF OUT REF OUT REF OUT
REMOTE REMOTE REMOTE REMOTE REMOTE REMOTE QUEUE QUEUE QUEUE QUEUE QUEUE QUEUE
Local Local Local Local Local Local Setup Setup Setup Setup Setup Setup
50Ω , 1 Vpp NOM 50Ω , 1 Vpp NOM 50Ω , 1 Vpp NOM 50Ω , 1 Vpp NOM
0.7 Vpp / 0 dBm MIN 0.7 Vpp / 0 dBm MIN 0.7 Vpp / 0 dBm MIN 0.7 Vpp / 0 dBm MIN 0 dBm MIN 0 dBm MIN 50Ω +10dBm 50Ω +10dBm
SR844 FP 96h 6 SR844 FP 96h 6 SR844 FP 97D SR844 FP 97C SR844 FP 97D SR844 FP 97A
4/17/97 RR 4/17/97 RR 1/21/97 RR 9/5/96 RR 3/4/97 RR 9/5/96 RR
Ref In Ref Out
SR844 RF Lock-In Amplifier
3-3
MHz MHz MHz MHz MHz MHz
kHz kHz kHz kHz kHz kHz
DEG DEG DEG DEG DEG DEG
V V V V V V
T.C. T.C. T.C. T.C. T.C. T.C.
I. F. I. F. I. F. I. F. I. F. I. F.
AxOut2 AxOut2 AxOut2 AxOut2 AxOut2 AxOut2
REFERENCE REFERENCE REFERENCE REFERENCE REFERENCE REFERENCE
Shift Shift Shift Shift Shift Shift
Shift Shift Shift Shift Shift Shift