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G.R.A.S. 67SB, Instruction Manual, Page: 5 / 14

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LI0056 – Revision 28 May 2015

The 67SB Package

The 67SB Blast Probe According to ANSI S12.42 is delivered as a preassembled pack-
age. The following table list all items delivered with the 67SB. Fig. 2 shows the 67SB 
in its travel case.

Included Items

Part Number

Blast Probe According to ANSI S12.42 (includes microphone and 
preamplifier in the probe housing, and a travel case)

67SB

1.5 mm Hex key

YY0012

External Calibration Adapter

GR1462

Calibration plug

GR1423

Manual

LI0056

Fig. 2. 

The 67SB in its travel case.

Summary of Contents for 67SB

Page 1: ...www gras dk LI0056 Revision 28 May 2015 Instruction Manual 67SB Blast Probe According to ANSI S12 42...

Page 2: ...1 4 Copyright Notice 2011 2015 G R A S Sound Vibration A S http www gras dk Any technical documentation that is made available by G R A S is the copyrighted work of G R A S and is owned by G R A S The...

Page 3: ...connecting the Two Parts of the Tube 7 Removing the Microphone Assembly 8 Reinstalling the Microphone Assembly 9 Calibration 10 In Situ Calibration 10 Separate Calibration 11 Technical Specifications...

Page 4: ...P as sensor The tube has a 3 4 inch thread for mounting on a tripod or similar device Fig 1 The 67SB seen from above and below 67SB Blast Probe Microphone Serial No XXXXXX G R A S Sound source Do not...

Page 5: ...list all items delivered with the 67SB Fig 2 shows the 67SB in its travel case Included Items Part Number Blast Probe According to ANSI S12 42 includes microphone and preamplifier in the probe housing...

Page 6: ...or removing sensor From preamplifier 7 pin LEMO G R A S Power Module Type 12AK Gain 20 10 30 40 50 0 HP Dir Lin AW Filter Overload Inst Latch SysCh Adjust Power On Ovl Reset Low Batt Signature Series...

Page 7: ...ecause of the drag provided by the O ring item 7 you may have to wriggle the parts slightly while pulling Do not use excessive force 4 8 2 3 6 5 1 7 The parts of the probe as shown in Fig 5 are 1 Prob...

Page 8: ...g Diaphragm inside the protective grid is flush with the probe s outer surface To remove the microphone 1 Use a 1 5 hex key to loosen the M2 hex screw and gently pull the microphone assembly out The p...

Page 9: ...esign and during assembly at the factory The guard ring must be properly seated against the upper inner wall of the tube M2 hex screw securing the assembly against the upper inner wall Correct positio...

Page 10: ...de the adapter ensures a proper fit over the microphone The correction factor is 0 04 dB 67SB Blast Probe Microphone Serial No XXXXXX G R A S Sound source For removing probe top For removing sensor Do...

Page 11: ...3 Mount the Calibration Adapter RA1423 in the pistonphone 4 Place the blast probe tube next to the pistonphone Do not attempt to remove the microphone cable from the tube 5 Push the microphone all the...

Page 12: ...00 Pa in this example is approximately 170 dB 2000 1000 0 1000 2000 3000 4000 5000 6000 7000 0 1 2 3 4 5 6 Magnitude Pa Time ms Time Domain of Impulse 67SB Dimensions and Data Probe Dimensions Length...

Page 13: ...re 20 Pa Effective front volume Nominal at 250Hz 0 1 mm3 Temperature range 30 C to 70 C Temperature coefficient 250Hz 30 C to 70 C 0 01 dB C Static pressure coefficient 250 Hz at 25 C 0 01 dB kPa Out...

Page 14: ...warranty Damaged diaphragms in microphones can be replaced The warranty does not cover products that are damaged due to negligent use an incorrect power supply or an incorrect connection to the equipm...

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